Covered by FixVibehigh

. CSRF vernd: Verja móti ólógligum statsbroytingum ZXCVFIXVIBESEND ZXCVFIXVIBESEG1. Lær teg at fyribyrgja falsan av fyrispurningum tvørtur um síður (CSRF) við at brúka Django millumforrit og SameSite farspor eginleikar. ZXCVFIXVIBESEND ZXCVFIXVIBESEG2. Følsan av fyrispurningum tvørtur um síður (CSRF) er framvegis ein týðandi hóttan móti vevforritum. Henda kanningin kannar, hvussu nútímans karmar sum Django seta verju í verk, og hvussu eginleikar á kagastøði sum SameSite geva verju í dýpdini móti óheimilaðum áheitanum. ZXCVFIXVIBESEND ZXCVFIXVIBESEG3. ## Ávirkan ZXCVFIXVIBESEND ZXCVFIXVIBESEG4. Cross-Site Request Forgery (CSRF) ger, at ein álopsmaður kann lumpa kagarin hjá einum offri til at fremja óynsktar handlingar á eini aðrari heimasíðu, har offrið í løtuni er autentiserað. Av tí at kagarar sjálvvirkandi innihalda umhvørvislig trúnaðarupplýsingar sum farspor í fyrispurningum, kann ein álopsmaður smiða støðubroytandi virksemi – so sum at broyta loyniorð, strika dátur ella byrja viðurskifti – uttan at brúkarin veit av tí. ZXCVFIXVIBESEND ZXCVFIXVIBESEG5. ## Rótorsøk ZXCVFIXVIBESEND ZXCVFIXVIBESEG6. Grundleggjandi orsøkin til CSRF er forsetta atferðin hjá kaganum at senda farspor, sum eru knýtt at einum øki, hvørja ferð ein áheitan verður gjørd til hetta økið, uttan mun til uppruna áheitanini ZXCVFIXVIBETOKEN0ZXCV. Uttan serliga staðfesting av, at ein áheitan varð tilætlað útloyst frá egnum brúkaragrunni hjá forritinum, kann ambætarin ikki skilja millum eina lógliga brúkarahandling og eina falsaða. ZXCVFIXVIBESEND ZXCVFIXVIBESEG7. ## Django CSRF verndarskipanir ZXCVFIXVIBESEND ZXCVFIXVIBESEG8. Django veitir eina innbygda verjuskipan til at minka um hesar váðar gjøgnum millumforrit og sniðmyndarintegratión ZXCVFIXVIBETOKEN0ZXCV. ZXCVFIXVIBESEND ZXCVFIXVIBESEG9. ### Virkjan av millumforriti ZXCVFIXVIBESEND ZXCVFIXVIBESEG10 ZXCVFIXVIBETOKEN0ZXCV hevur ábyrgdina av CSRF verju og er vanliga virkið sum standard ZXCVFIXVIBETOKEN1ZXCV. Tað skal setast áðrenn nakra sýnismiðalforrit, sum gongur út frá, at CSRF álop longu eru avgreidd ZXCVFIXVIBETOKEN2ZXCV. ZXCVFIXVIBESEND ZXCVFIXVIBESEG11 ### Umsiting av fyrimynd ZXCVFIXVIBESEND ZXCVFIXVIBESEG12 Fyri øll innanhýsis POST-oyðubløð skulu forritarar hava ZXCVFIXVIBETOKEN0ZXCV-merkið inni í ZXCVFIXVIBETOKEN1ZXCV-elementinum ZXCVFIXVIBETOKEN2ZXCV. Hetta tryggjar, at eitt einkult, loyniligt token er við í áheitanini, sum ambætarin síðani validerar móti setuni hjá brúkaranum. ZXCVFIXVIBESEND ZXCVFIXVIBESEG13 ### Váði fyri lekum token ZXCVFIXVIBESEND ZXCVFIXVIBESEG14 Ein kritisk implementeringsdetalja er, at ZXCVFIXVIBETOKEN0ZXCV ongantíð skal vera við í oyðubløðum, sum miða móti uttanhýsis slóðum ZXCVFIXVIBETOKEN1ZXCV. At gera tað vildi lekt loyniliga CSRF-merkið til ein triðja part, og møguliga sett setutrygdina hjá brúkaranum í vanda ZXCVFIXVIBETOKEN2ZXCV. ZXCVFIXVIBESEND ZXCVFIXVIBESEG15 ## Verja á kagastigi: Farspor á somu síðu ZXCVFIXVIBESEND ZXCVFIXVIBESEG16 Nútímans kagarar hava innført ZXCVFIXVIBETOKEN0ZXCV eginleikan til ZXCVFIXVIBETOKEN1ZXCV-høvdið fyri at geva eitt lag av verju-í-dýpdini ZXCVFIXVIBETOKEN2ZXCV. ZXCVFIXVIBESEND ZXCVFIXVIBESEG17 - Strongt: Farspor verður bert sendur í einum fyrstapartssamanhangi, sum merkir, at síðan í URL-strikuni passar til økið hjá farsporinum ZXCVFIXVIBETOKEN0ZXCV. ZXCVFIXVIBESEND ZXCVFIXVIBESEG18 - Lax: Farspor verður ikki sendur á undirfyrispurningum tvørtur um síður (so sum myndir ella rammur) men verður sendur tá ein brúkari navigerar til upprunasíðuna, eitt nú við at fylgja eini vanligari leinkju ZXCVFIXVIBETOKEN0ZXCV. ZXCVFIXVIBESEND ZXCVFIXVIBESEG19 ## Hvussu ZXCVFIXVIBETOKEN0ZXCV roynir fyri tí ZXCVFIXVIBESEND ZXCVFIXVIBESEG20 ZXCVFIXVIBETOKEN1ZXCV inniheldur nú CSRF verju sum gated virknan kanning. Eftir økisváttan kannar ZXCVFIXVIBETOKEN0ZXCV uppdagaðar tilstandsbroytandi oyðubløð, kannar fyri CSRF-token-formaðum inputum og SameSite farsporsignalum, roynir síðani eina lág-ávirkan falskaða uppruna innsending og greiðir bert frá, tá ambætarin góðtekur tað. Farsporkanningar merkja eisini veikar SameSite eginleikar, sum minka um CSRF verjuna í dýpdini.

Cross-Site Request Forgery (CSRF) remains a significant threat to web applications. This research explores how modern frameworks like Django implement protection and how browser-level attributes like SameSite provide defense-in-depth against unauthorized requests.

CWE-352

Impact

Cross-Site Request Forgery (CSRF) allows an attacker to trick a victim's browser into performing unwanted actions on a different website where the victim is currently authenticated. Because browsers automatically include ambient credentials like cookies in requests, an attacker can forge state-changing operations—such as changing passwords, deleting data, or initiating transactions—without the user's knowledge.

Root Cause

The fundamental cause of CSRF is the web browser's default behavior of sending cookies associated with a domain whenever a request is made to that domain, regardless of the request's origin [S1]. Without specific validation that a request was intentionally triggered from the application's own user interface, the server cannot distinguish between a legitimate user action and a forged one.

Django CSRF Protection Mechanisms

Django provides a built-in defense system to mitigate these risks through middleware and template integration [S2].

Middleware Activation

The django.middleware.csrf.CsrfViewMiddleware is responsible for CSRF protection and is typically enabled by default [S2]. It must be positioned before any view middleware that assumes CSRF attacks have already been handled [S2].

Template Implementation

For any internal POST forms, developers must include the {% csrf_token %} tag inside the <form> element [S2]. This ensures that a unique, secret token is included in the request, which the server then validates against the user's session.

Token Leakage Risks

A critical implementation detail is that the {% csrf_token %} should never be included in forms targeting external URLs [S2]. Doing so would leak the secret CSRF token to a third party, potentially compromising the user's session security [S2].

Browser-Level Defense: SameSite Cookies

Modern browsers have introduced the SameSite attribute for the Set-Cookie header to provide a layer of defense-in-depth [S1].

Strict: The cookie is only sent in a first-party context, meaning the site in the URL bar matches the cookie's domain [S1].
Lax: The cookie is not sent on cross-site subrequests (such as images or frames) but is sent when a user navigates to the origin site, such as by following a standard link [S1].

How FixVibe tests for it

FixVibe now includes CSRF protection as a gated active check. After domain verification, active.csrf-protection inspects discovered state-changing forms, checks for CSRF-token-shaped inputs and SameSite cookie signals, then attempts a low-impact forged-origin submission and only reports when the server accepts it. Cookie checks also flag weak SameSite attributes that reduce CSRF defense-in-depth.