{"id":505,"date":"2022-08-06T22:53:54","date_gmt":"2022-08-06T22:53:54","guid":{"rendered":"https:\/\/securitybriefing.net\/?p=505"},"modified":"2022-08-06T22:53:54","modified_gmt":"2022-08-06T22:53:54","slug":"sql-injection-101-vad-ar-sqli-och-hur-man-forhindrar-attacker","status":"publish","type":"post","link":"https:\/\/securitybriefing.net\/sv\/sakerhet\/sql-injection-101-vad-ar-sqli-och-hur-man-forhindrar-attacker\/","title":{"rendered":"SQL Injection 101: Vad \u00e4r SQLi och hur man f\u00f6rhindrar angrepp"},"content":{"rendered":"

Vad \u00e4r SQL-injektion?<\/strong><\/h2>\n\n\n

SQL-injektion (SQLi) \u00e4r en typ av attack som g\u00f6r det m\u00f6jligt f\u00f6r brottslingar att exekvera skadliga SQL-satser mot s\u00e5rbara webbapplikationer. Angripare kan komma \u00e5t k\u00e4nsliga data, som kundinformation, personuppgifter, aff\u00e4rshemligheter och mycket mer genom att kringg\u00e5 applikationens s\u00e4kerhets\u00e5tg\u00e4rder. H\u00e4r kommer vi att diskutera SQL-injektion, hur det fungerar och hur du kan f\u00f6rhindra attacker.<\/p>\n\n\n\n

SQL-injektionsattacker kan intr\u00e4ffa p\u00e5 alla webbplatser som anv\u00e4nder en SQL-databas. Denna typ av attack g\u00f6r det m\u00f6jligt f\u00f6r angripare att f\u00e5 tillg\u00e5ng till dina viktiga data. De kan se konsumentinformation, personuppgifter, aff\u00e4rshemligheter och immateriella r\u00e4ttigheter. Detta \u00e4r en av de allvarligaste typerna av attacker mot webbapplikationer, enligt OWASP.<\/p>\n\n\n

Typer av SQL-injektion<\/strong><\/h2>\n\n\n
\"Typer<\/figure>\n\n\n

In-band SQLi<\/strong><\/h3>\n\n\n

In-band SQL injection \u00e4r en attack d\u00e4r angriparen anv\u00e4nder samma kanal f\u00f6r att skicka och ta emot fr\u00e5gor. In-band inneb\u00e4r att svaret erh\u00e5lls med hj\u00e4lp av samma kommunikationsmedium. Angriparens m\u00e5l \u00e4r att f\u00e5 svaret i en webbl\u00e4sare omedelbart, om m\u00f6jligt genom att utf\u00f6ra attacken manuellt med en webbl\u00e4sare.<\/p>\n\n\n\n

Exempel p\u00e5 in-band SQL-injektion<\/strong><\/p>\n\n\n\n

Det vanligaste s\u00e4ttet f\u00f6r en angripare att g\u00f6ra en SQL-injektion in-band \u00e4r att \u00e4ndra beg\u00e4ran s\u00e5 att de kan se den aktuella anv\u00e4ndarens personliga information. Detta kan g\u00f6ras genom att \u00e4ndra det v\u00e4rde som skickas som en del av beg\u00e4ran. Om meddelandet till exempel skulle visa anv\u00e4ndarens namn, kan angriparen \u00e4ndra det s\u00e5 att anv\u00e4ndarens namn visas i st\u00e4llet.<\/p>\n\n\n\n

SELECT * FR\u00c5N anv\u00e4ndare D\u00c4R anv\u00e4ndar_id LIKNAR 'nuvarande_anv\u00e4ndare'<\/pre>\n\n\n\n
Felbaserad SQLi och unionsbaserad SQLi \u00e4r de tv\u00e5 vanligaste formerna av SQL-injektion i band.<\/p>\n\n\n
Felbaserad SQLi<\/strong><\/h4>\n\n\n
En felbaserad SQLi-teknik \u00e4r en metod f\u00f6r SQL-injektion i bandet som utnyttjar felmeddelanden fr\u00e5n databasservern f\u00f6r att uppt\u00e4cka databasens arkitektur. Felbaserad SQL-injektion \u00e4r den vanligaste typen av in-band SQL-injektion.<\/p>\n\n\n\n
Exempel p\u00e5 felbaserad SQLi:<\/strong><\/p>\n\n\n\n
Om en angripare f\u00f6rs\u00f6ker logga in med f\u00f6ljande autentiseringsuppgifter:<\/p>\n\n\n\n
anv\u00e4ndarnamn: ' OR 'a'='al\u00f6senord: n\u00e5got<\/pre>\n\n\n\n
Databasen kommer att returnera ett felmeddelande eftersom uttalandet \u00e4r syntaktiskt felaktigt. Felmeddelandet avsl\u00f6jar information om databasen, som angriparen kan anv\u00e4nda till sin f\u00f6rdel.<\/p>\n\n\n
Unionsbaserad SQLi:<\/strong><\/h4>\n\n\n
In-band SQL-injektion \u00e4r ett s\u00e4tt att h\u00e4mta information fr\u00e5n en webbplats med hj\u00e4lp av UNION-operatorn f\u00f6r att kombinera utdata fr\u00e5n tv\u00e5 eller flera SELECT-satser.<\/p>\n\n\n
Blind SQL-injektion<\/strong><\/h3>\n\n\n
Blind SQL-injektion \u00e4r en attack d\u00e4r angriparen f\u00f6rs\u00f6ker f\u00e5 svar fr\u00e5n databasen genom att st\u00e4lla fr\u00e5gor som resulterar i ett sant eller falskt svar. Angriparen anv\u00e4nder felmeddelanden f\u00f6r att se om applikationen reagerar annorlunda n\u00e4r en viss kod anv\u00e4nds.<\/p>\n\n\n\n
N\u00e4r en hacker anv\u00e4nder SQL-injektion kan webbapplikationen visa kritiska databasvarningsmeddelanden som anger att SQL-fr\u00e5gans syntax \u00e4r felaktig. Blind SQL-injektion fungerar p\u00e5 samma s\u00e4tt som traditionell SQL-injektion, med undantag f\u00f6r hur data h\u00e4mtas fr\u00e5n databasen. Om en databas inte inneh\u00e5ller tillr\u00e4ckligt med information f\u00f6r att en angripare ska kunna utnyttja den, m\u00e5ste angriparen st\u00e4lla en rad fr\u00e5gor f\u00f6r att f\u00e5 fram data.<\/p>\n\n\n\n
Blind SQL-injektion delas in i blind-booleanbaserad SQLi och blind-tidsbaserad SQLi.<\/p>\n\n\n
Boolean-baserad blind SQLi<\/strong><\/h4>\n\n\n
Boolean-based Blind SQL injection \u00e4r en attack d\u00e4r angriparen f\u00f6rs\u00f6ker f\u00e5 svar fr\u00e5n databasen genom att st\u00e4lla fr\u00e5gor som resulterar i ett sant eller falskt svar. Angriparen anv\u00e4nder felmeddelanden f\u00f6r att se om programmet reagerar annorlunda n\u00e4r en viss kod anv\u00e4nds.<\/p>\n\n\n\n
Exempel p\u00e5 booleanbaserad Blind SQLi:<\/p>\n\n\n\n
Om en angripare vill ta reda p\u00e5 databastypen anv\u00e4nder han eller hon f\u00f6ljande f\u00f6rklaring:<\/p>\n\n\n\n
SELECT * FROM users WHERE user_id LIKE 'current_user' och database() like '%type%'<\/pre>\n\n\n\n
Om databasen \u00e4r MySQL skulle utdata vara ungef\u00e4r s\u00e5 h\u00e4r:<\/p>\n\n\n\n
Du har ett fel i din SQL-syntax; kontrollera manualen som motsvarar din MySQL-serverversion f\u00f6r r\u00e4tt syntax att anv\u00e4nda n\u00e4ra 'and database() like '%type%\" p\u00e5 rad<\/p>\n\n\n
Tidsbaserad blind SQL-injektion<\/strong><\/h4>\n\n\n
En tidsbaserad blind attack \u00e4r n\u00e4r ett SQL-kommando skickas till servern med kod som g\u00f6r att fr\u00e5gorna exekveras l\u00e5ngsammare.<\/p>\n\n\n\n
Tidsbaserade blinda attacker g\u00f6r det m\u00f6jligt f\u00f6r angripare att extrahera data baserat p\u00e5 \u00e5tkomsttid. En s\u00e5dan attack \u00e4r k\u00e4nd som en blind eller inferentiell injektionsattack. Det h\u00e4r \u00e4r en typ av angrepp d\u00e4r inga data fl\u00f6dar mellan angriparen och databasen, men eftersom det inte finns n\u00e5got svar kallas det ocks\u00e5 f\u00f6r en blind injektionsattack.<\/p>\n\n\n\n
Svarstiden indikerar om svaret \u00e4r korrekt eller felaktigt. Om svaret \u00e4r negativt kommer inkr\u00e4ktaren att g\u00f6ra en ny f\u00f6rfr\u00e5gan. Denna angreppsteknik \u00e4r l\u00e5ngsam eftersom hackaren m\u00e5ste g\u00e5 igenom varje tecken f\u00f6r sig, s\u00e4rskilt vid angrepp p\u00e5 stora databaser.<\/p>\n\n\n\n
Exempel p\u00e5 blind SQLi<\/strong><\/p>\n\n\n\n
I det h\u00e4r exemplet f\u00f6rs\u00f6ker angriparen ta reda p\u00e5 om anv\u00e4ndaren med id=999 finns i databasen. F\u00f6r att g\u00f6ra detta anv\u00e4nder de f\u00f6ljande uttalande:<\/p>\n\n\n\n
OM(SUBSTRING((V\u00c4LJ l\u00f6senord FR\u00c5N anv\u00e4ndare D\u00c4R anv\u00e4ndar_id=999),0, L\u00c4NGD('hemlighet'))='hemlighet', SOV(30), 'falsk')<\/pre>\n\n\n\n
Om anv\u00e4ndaren med id 999 finns i databasen och l\u00f6senordet \u00e4r hemligt, kommer programmet att sova i 30 sekunder. Applikationen returnerar false om anv\u00e4ndaren inte finns i databasen.<\/p>\n\n\n
SQLi utanf\u00f6r bandbredd<\/strong><\/h3>\n\n\n
Den som vill stj\u00e4la data kan skicka SQL-kod till en databasserver p\u00e5 ett s\u00e4tt som inte ing\u00e5r i den vanliga kommunikationen mellan servern och andra datorer. Detta kan g\u00f6ras genom att skicka information till servern via DNS- eller HTTP-f\u00f6rfr\u00e5gningar.<\/p>\n\n\n\n
Appens svar p\u00e5verkas inte av om data returneras eller inte, om det finns ett problem med databasen eller inte, eller hur l\u00e5ng tid det tar att exekvera fr\u00e5gan. Out-of-band kan anv\u00e4ndas i n\u00e4tverksinteraktioner f\u00f6r att utl\u00f6sa valfria h\u00e4ndelser. Beroende p\u00e5 ett injicerat villkor kan dessa aktiveras villkorligt f\u00f6r att f\u00e5 kunskap en bit i taget.<\/p>\n\n\n\n
Data kan ocks\u00e5 l\u00e4cka via flera n\u00e4tverksprotokoll fr\u00e5n n\u00e4tverksinteraktioner. Bilden visar den beg\u00e4ran som skickas fr\u00e5n webbapplikationen till appens databas.<\/p>\n\n\n\n
Exempel p\u00e5 SQLi utanf\u00f6r bandbredden<\/strong><\/p>\n\n\n\n
I det h\u00e4r exemplet f\u00f6rs\u00f6ker angriparen ta reda p\u00e5 om en viss anv\u00e4ndare finns i databasen. F\u00f6r att g\u00f6ra detta anv\u00e4nder de f\u00f6ljande uttalande:<\/p>\n\n\n\n
SELECT user_id FROM users WHERE username='$username' AND password='$password' LIMIT 0,0 UNION SELECT NULL,'' INTO OUTFILE '\/var\/opt\/databaser\/$filename.php'; --<\/pre>\n\n\n\n
Programmet returnerar anv\u00e4ndarens anv\u00e4ndar-ID om anv\u00e4ndaren finns i databasen. Om anv\u00e4ndaren inte finns i databasen skapar programmet en fil som inneh\u00e5ller PHP-kod som kan anv\u00e4ndas f\u00f6r att utf\u00f6ra systemkommandon. Angriparen kan sedan anv\u00e4nda den h\u00e4r filen f\u00f6r att k\u00f6ra kommandon p\u00e5 servern.<\/p>\n\n\n
S\u00e5 h\u00e4r f\u00f6rhindrar du en SQL-injektion<\/strong><\/h2>\n\n\n
Det b\u00e4sta s\u00e4ttet att skydda sig mot SQL-injektionsattacker \u00e4r att anv\u00e4nda indatavalidering, f\u00f6rberedda satser och parametriserade fr\u00e5gor. Koden ska aldrig anv\u00e4nda anv\u00e4ndarens inmatning direkt. Utvecklare m\u00e5ste rensa all inmatning ist\u00e4llet f\u00f6r att bara rensa inmatningar i webbformul\u00e4r, t.ex. inloggningsformul\u00e4r. Enkla citattecken b\u00f6r elimineras fr\u00e5n alla tvivelaktiga kodkomponenter. Det \u00e4r ocks\u00e5 en bra id\u00e9 att d\u00f6lja databasproblem p\u00e5 live-webbplatser f\u00f6r att undvika att oavsiktligt avsl\u00f6ja dem. SQL-injektion kan ge information om ett databassystem som angripare kan anv\u00e4nda till sin f\u00f6rdel.<\/p>\n\n\n\n
Om du uppt\u00e4cker ett problem med din webbplats b\u00f6r du omedelbart ta den offline och kontakta din hostingleverant\u00f6r. De kan hj\u00e4lpa dig att avg\u00f6ra om din webbplats har \u00e4ventyrats eller inte och vilka steg du beh\u00f6ver ta f\u00f6r att \u00e5tg\u00e4rda problemet. Under tiden ska du se till att alla anv\u00e4ndare av din webbplats k\u00e4nner till problemet och \u00e4ndrar sina l\u00f6senord s\u00e5 snart som m\u00f6jligt.<\/p>\n\n\n
F\u00f6rebyggande tips f\u00f6r att undvika SQL-injektioner<\/strong><\/h2>\n\n\n
Det finns n\u00e5gra s\u00e4tt att undvika SQL-injektionss\u00e5rbarheter i ditt programmeringsspr\u00e5k och din databaskonfiguration. Dessa tekniker kan anv\u00e4ndas med de flesta databaser, till exempel XML. Du kan anv\u00e4nda dessa tekniker f\u00f6r att g\u00f6ra dina databaser s\u00e4krare.<\/p>\n\n\n
1) Anv\u00e4ndning av korrekt konstruerade lagrade procedurer<\/h3>\n\n\n
Nyb\u00f6rjare b\u00f6r b\u00f6rja med att l\u00e4ra sig hur man skapar satser med variabler. Detta \u00e4r enklare \u00e4n att skapa dynamiska fr\u00e5gor, och det \u00e4r l\u00e4ttare att f\u00f6rst\u00e5. Parametriserade fr\u00e5gor inneb\u00e4r att utvecklaren skapar all SQL-kod och sedan anger varje parameter vid ett senare tillf\u00e4lle. Denna metod g\u00f6r det m\u00f6jligt f\u00f6r databasen att identifiera mellan k\u00e4llkod och information.<\/p>\n\n\n\n
Prepared statements hj\u00e4lper till att s\u00e4kerst\u00e4lla att m\u00e5let med en fr\u00e5ga inte \u00e4ndras, \u00e4ven om n\u00e5gon f\u00f6rs\u00f6ker ge SQL-instruktioner.<\/p>\n\n\n
2) Validering av inmatning f\u00f6r till\u00e5t-lista<\/h3>\n\n\n
SQL-fr\u00e5gor anv\u00e4nder bindningsvariabler p\u00e5 specifika platser f\u00f6r data. Om du till exempel anv\u00e4nder Python skulle du anv\u00e4nda %s<\/strong> platsh\u00e5llare. Du kan anv\u00e4nda ett regulj\u00e4rt uttryck f\u00f6r att validera anv\u00e4ndarens inmatning mot listan \u00f6ver till\u00e5tna tecken i varje bindningsvariabel.<\/p>\n\n\n\n
Om du anv\u00e4nder JavaScript kan du anv\u00e4nda \\w<\/strong> f\u00f6r att matcha alfanumeriska och understreckade tecken.<\/p>\n\n\n\n
Allow-listan b\u00f6r vara s\u00e5 specifik som m\u00f6jligt f\u00f6r att undvika falska positiva resultat.<\/p>\n\n\n\n
Om du till exempel letar efter ett amerikanskt telefonnummer kan du anv\u00e4nda f\u00f6ljande regulj\u00e4ra uttryck:<\/p>\n\n\n\n
\/^\\d{11}$\/<\/pre>\n\n\n\n
Detta skulle matcha en str\u00e4ng med 11 siffror som skulle kunna vara ett telefonnummer. Om n\u00e5gon f\u00f6rs\u00f6kte skicka in n\u00e5got i stil med 'abcdef<\/strong>', skulle det inte st\u00e4mma och inmatningen skulle vara ogiltig.<\/p>\n\n\n\n
Detta hj\u00e4lper dig att se till att dina data \u00e4r s\u00e4kra och sunda. Om du beh\u00f6ver anv\u00e4nda v\u00e4rden fr\u00e5n kod i st\u00e4llet f\u00f6r anv\u00e4ndarparametrar \u00e4r det ocks\u00e5 okej!<\/p>\n\n\n\n
Det kan dock h\u00e4nda att anv\u00e4ndarparameterv\u00e4rden riktar sig till specifika tabell- och kolumnnamn. I s\u00e5 fall b\u00f6r parameterv\u00e4rdena mappas till motsvarande tabell- och kolumnnamn f\u00f6r att s\u00e4kerst\u00e4lla att obekr\u00e4ftade anv\u00e4ndarinmatningar inte kommer med i fr\u00e5gan.<\/p>\n\n\n
3) Anv\u00e4nd vitlistor<\/h3>\n\n\n
Filtrera inte anv\u00e4ndarinmatning baserat p\u00e5 svarta listor med d\u00e5liga tecken. Det \u00e4r mycket effektivare att anv\u00e4nda till\u00e5t-listor med bra tecken som f\u00f6rv\u00e4ntas i specifika f\u00e4lt. Detta kommer att stoppa SQL-injektionsattacker innan de b\u00f6rjar.<\/p>\n\n\n\n
Till exempel, till\u00e5t bara siffror och bindestreck i inmatningsf\u00e4ltet om du f\u00f6rv\u00e4ntar dig ett telefonnummer. Om du f\u00f6rv\u00e4ntar dig en e-postadress ska du bara till\u00e5ta tecken som \u00e4r giltiga i en e-postadress.<\/p>\n\n\n
4) Anv\u00e4nd de mest uppdaterade plattformarna<\/h3>\n\n\n
PHP har inte SQLi-skydd i \u00e4ldre webbutvecklingsplattformar. Anv\u00e4nd den mest uppdaterade utg\u00e5van av programmeringsmilj\u00f6n, spr\u00e5ket och tillh\u00f6rande teknik som finns tillg\u00e4nglig. I st\u00e4llet f\u00f6r PHP anv\u00e4nder vi i detta exempel PDO.<\/p>\n\n\n
5) Skanna din webbapplikation regelbundet<\/h3>\n\n\n
SQL-injektioner kan vara mycket sv\u00e5ra att uppt\u00e4cka. Det \u00e4r viktigt att regelbundet skanna din webbapplikation efter s\u00e5rbarheter.<\/p>\n\n\n
6) Genomdrivande av l\u00e4gsta privilegium<\/h3>\n\n\n
Principen om minsta m\u00f6jliga beh\u00f6righet \u00e4r ett s\u00e4kerhetskoncept som begr\u00e4nsar anv\u00e4ndarnas \u00e5tkomst till det minimum de beh\u00f6ver f\u00f6r att utf\u00f6ra sitt arbete. Detta inneb\u00e4r att man begr\u00e4nsar antalet konton som anv\u00e4ndarna har och vilka beh\u00f6righeter dessa konton har.<\/p>\n\n\n\n
LRF (Least Restriction on Functionality) \u00e4r en metod och ett koncept f\u00f6r att begr\u00e4nsa anv\u00e4ndarr\u00e4ttigheter, konton och dataprocesser till endast de resurser som kr\u00e4vs f\u00f6r grundl\u00e4ggande, godtagbara uppgifter. Detta bidrar till att uppr\u00e4tth\u00e5lla minimala anv\u00e4ndarr\u00e4ttigheter eller beh\u00f6righetsniv\u00e5er, vilket \u00e4r avg\u00f6rande f\u00f6r att m\u00e4nniskor ska kunna utf\u00f6ra sina jobb p\u00e5 ett effektivt s\u00e4tt.<\/p>\n\n\n\n
Least privilege \u00e4r en s\u00e4kerhetsprincip som inneb\u00e4r att applikationer, system och prylar endast ska ha de beh\u00f6righeter som kr\u00e4vs f\u00f6r att utf\u00f6ra en viss uppgift. P\u00e5 s\u00e5 s\u00e4tt begr\u00e4nsas effekten om n\u00e5gon lyckas utnyttja en s\u00e5rbarhet och g\u00f6ra skada. Detta st\u00e5r i kontrast till att ge anv\u00e4ndare fler beh\u00f6righeter \u00e4n de beh\u00f6ver, vilket \u00f6kar risken f\u00f6r betydande skada vid en SQL-attack.<\/p>\n\n\n
SQL Injection - Vanliga fr\u00e5gor och svar<\/strong><\/h2>\n\n\n
\u00a0<\/div><\/div>\n\n\n\n
\n
Vilken \u00e4r den vanligaste SQL-injektionen?<\/strong>\n
In-band SQL-injektion \u00e4r den vanligaste typen av SQL-injektionsattack. Det intr\u00e4ffar n\u00e4r en angripare kan anv\u00e4nda samma kommunikationskanal f\u00f6r att leverera nyttolasten och samla in resultat.<\/p>\n<\/div>\n
Vad \u00e4r det b\u00e4sta f\u00f6rsvaret mot SQL-injektion?<\/strong>\n
Det b\u00e4sta f\u00f6rsvaret mot SQL-injektion \u00e4r att anv\u00e4nda parametriserade fr\u00e5gor. Den h\u00e4r typen av fr\u00e5gor anv\u00e4nder platsh\u00e5llarv\u00e4rden f\u00f6r parametrar, som anges vid ett senare tillf\u00e4lle. Denna metod g\u00f6r det m\u00f6jligt f\u00f6r databasen att skilja mellan k\u00e4llkod och information.<\/p>\n<\/div>\n
Hur uppt\u00e4cks SQL-injektion?<\/strong>\n
SQL-injektion kan uppt\u00e4ckas p\u00e5 flera s\u00e4tt. En metod \u00e4r att anv\u00e4nda en brandv\u00e4gg f\u00f6r webbapplikationer (WAF). En WAF \u00e4r en h\u00e5rdvara eller mjukvara som sitter mellan en webbapplikation och internet. Den inspekterar trafiken efter skadlig aktivitet och kan blockera SQL-injektionsattacker.<\/p>\n<\/div>\n
Vad \u00e4r SQL-injektion av andra ordningen?<\/strong>\n
SQL-injektion av andra ordningen intr\u00e4ffar n\u00e4r en angripare kan injicera en nyttolast som lagras av webbapplikationen och sedan exekveras senare. Denna typ av attack \u00e4r sv\u00e5rare att genomf\u00f6ra eftersom angriparen m\u00e5ste ha ett s\u00e4tt att utl\u00f6sa exekveringen av den lagrade nyttolasten.<\/p>\n<\/div>\n
Vad \u00e4r blind SQL-injektion?<\/strong>\n
Blind SQL-injektion \u00e4r en attack d\u00e4r angriparen inte direkt ser resultaten av sin nyttolast. Ist\u00e4llet m\u00e5ste de anv\u00e4nda sanna eller falska p\u00e5st\u00e5enden f\u00f6r att h\u00e4rleda information fr\u00e5n databasen. Denna typ av attack \u00e4r mer utmanande att utf\u00f6ra men kan vara lika farlig som andra typer av SQL-injektion.<\/p>\n<\/div>\n
Vad \u00e4r en staplad fr\u00e5ga?<\/strong>\n
En staplad fr\u00e5ga \u00e4r en typ av SQL-injektion d\u00e4r angriparen anv\u00e4nder flera fr\u00e5gor f\u00f6r att h\u00e4mta information fr\u00e5n databasen. Denna typ av attack \u00e4r mer utmanande att utf\u00f6ra men kan vara mycket farlig om den lyckas.<\/p>\n<\/div>\n
Vad \u00e4r en felbaserad SQL-injektion?<\/strong>\n
Felbaserad SQL-injektion \u00e4r en attack d\u00e4r angriparen anv\u00e4nder databasfel f\u00f6r att h\u00e4rleda information fr\u00e5n databasen. Denna attack \u00e4r mer utmanande att utf\u00f6ra men kan vara mycket farlig om den lyckas.<\/p>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"
Vad \u00e4r SQL-injektion SQL-injektion (SQLi) \u00e4r en typ av attack som g\u00f6r det m\u00f6jligt f\u00f6r brottslingar att k\u00f6ra skadliga SQL-satser mot s\u00e5rbara webbapplikationer. Angripare kan komma \u00e5t k\u00e4nslig data, till exempel... Continue reading SQL Injection 101: Vad \u00e4r SQLi och hur man f\u00f6rhindrar angrepp<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":644,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[],"class_list":["post-505","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-security","entry"],"yoast_head":"\nWhat is SQLi and How to Prevent Attacks | securitybriefing<\/title>\n<meta name=\"description\" content=\"Learn the basics of SQL injection. what is SQL injection, how does it work, and what ways to protect your site from attacks.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/securitybriefing.net\/sv\/sakerhet\/sql-injection-101-vad-ar-sqli-och-hur-man-forhindrar-attacker\/\" \/>\n<meta property=\"og:locale\" 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Hon skrev tidigare f\u00f6r PYMNTS och The Bay State Banner och har en BA i kreativt skrivande fr\u00e5n Carnegie Mellon. Hon \u00e4r baserad utanf\u00f6r Boston.","sameAs":["http:\/\/securitybriefing.net"],"url":"https:\/\/securitybriefing.net\/sv\/author\/security\/"},{"@type":"Question","@id":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826159348","position":1,"url":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826159348","name":"Vilken \u00e4r den vanligaste SQL-injektionen?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"In-band SQL injection is the most common type of SQL injection attack. It occurs when an attacker can use the same communication channel to deliver the payload and gather results.","inLanguage":"sv-SE"},"inLanguage":"sv-SE"},{"@type":"Question","@id":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826187832","position":2,"url":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826187832","name":"Vad \u00e4r det b\u00e4sta f\u00f6rsvaret mot SQL-injektion?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The best defense against SQL injection is to use parameterized queries. This type of query uses placeholder values for parameters, which are supplied at a later date. This method allows the database to identify between source code and information.","inLanguage":"sv-SE"},"inLanguage":"sv-SE"},{"@type":"Question","@id":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826216670","position":3,"url":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826216670","name":"Hur uppt\u00e4cks SQL-injektion?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"SQL injection can be detected in several ways. One method is to use a web application firewall (WAF). A WAF is a piece of hardware or software that sits between a web application and the internet. It inspects traffic for malicious activity and can block SQL injection attacks.","inLanguage":"sv-SE"},"inLanguage":"sv-SE"},{"@type":"Question","@id":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826245103","position":4,"url":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826245103","name":"Vad \u00e4r SQL-injektion av andra ordningen?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Second-order SQL injection occurs when an attacker can inject a payload that is stored by the web application and then later executed. This type of attack is more difficult to achieve because the attacker must have a way to trigger the execution of the stored payload.","inLanguage":"sv-SE"},"inLanguage":"sv-SE"},{"@type":"Question","@id":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826275267","position":5,"url":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826275267","name":"Vad \u00e4r blind SQL-injektion?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Blind SQL injection is an attack where the attacker does not directly see the results of their payload. Instead, they must use true or false statements to infer information from the database. This type of attack is more challenging to execute but can be just as dangerous as other types of SQL injection.","inLanguage":"sv-SE"},"inLanguage":"sv-SE"},{"@type":"Question","@id":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826301781","position":6,"url":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826301781","name":"Vad \u00e4r en staplad fr\u00e5ga?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"A stacked query is a type of SQL injection where the attacker uses multiple queries to extract information from the database. This type of attack is more challenging to execute but can be very dangerous if successful.","inLanguage":"sv-SE"},"inLanguage":"sv-SE"},{"@type":"Question","@id":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826330814","position":7,"url":"https:\/\/securitybriefing.net\/security\/sql-injection-101-what-is-sqli-and-how-to-prevent-attacks\/#faq-question-1659826330814","name":"Vad \u00e4r en felbaserad SQL-injektion?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Error-based SQL injection is an attack where the attacker uses database errors to infer information from the database. This attack is more challenging to execute but can be very dangerous if successful.","inLanguage":"sv-SE"},"inLanguage":"sv-SE"}]}},"_links":{"self":[{"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/posts\/505","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/comments?post=505"}],"version-history":[{"count":0,"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/posts\/505\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/media\/644"}],"wp:attachment":[{"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/media?parent=505"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/categories?post=505"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/securitybriefing.net\/sv\/wp-json\/wp\/v2\/tags?post=505"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}