Covered by FixVibehigh

JWT Sekirite: Risk pou siy ki pa garanti ak Validasyon Reklamasyon ki manke ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG1 Move aplikasyon JWT, tankou aksepte 'okenn' algorithm la oswa li pa valide reklamasyon 'exp' ak 'aud', ka mennen nan kontoune otantifikasyon. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG2 JSON Web Tokens (JWTs) bay yon estanda pou transfere reklamasyon, men sekirite depann sou validasyon solid. Si yo pa verifye siyati yo, tan ekspirasyon yo, oswa odyans yo gen entansyon pèmèt atakè yo kontoune otantifikasyon oswa jeton reparèt. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG3 ## Enpak Atakè ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG4 Move validation ZXCVFIXVIBETOKEN4ZXCV pèmèt atakè yo kontoune mekanis otantifikasyon pa fòje reklamasyon oswa reitilize siy ekspire ZXCVFIXVIBETOKEN1ZXCV. Si yon sèvè aksepte siy san yon siyati ki valab, yon atakè ka modifye chaj la pou ogmante privilèj oswa pèsonn nenpòt itilizatè ZXCVFIXVIBETOKEN2ZXCV. Anplis de sa, si w pa aplike reklamasyon ekspirasyon an (JWT) pèmèt yon atakè sèvi ak yon siy konpwomèt endefiniman ZXCVFIXVIBETOKEN3ZXCV. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG5 ## Kòz Rasin ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG6 Yon JSON Web Token (ZXCVFIXVIBETOKEN1ZXCV) se yon estrikti ki baze sou JSON ki itilize pou reprezante reklamasyon ki siyen nimerik oswa ki pwoteje entegrite JWT. Echèk sekirite anjeneral soti nan de twou vid ki genyen nan aplikasyon prensipal: ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG7 1. Akseptasyon JWT ki pa gen sekirite yo: Si yon sèvis pa aplike verifikasyon siyati a sevè, li ka trete "JWT ki pa gen sekirite" kote siyati a absan epi algorithm la mete sou "okenn" JWT. Nan senaryo sa a, sèvè a fè konfyans reklamasyon yo nan chaj la san yo pa verifye entegrite yo ZXCVFIXVIBETOKEN1ZXCV. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG8 2. Validasyon Reklamasyon ki manke yo: Reklamasyon JWT (tan ekspirasyon) idantifye lè oswa apre yo pa dwe aksepte ZXCVFIXVIBETOKEN5ZXCV pou trete ZXCVFIXVIBETOKEN2ZXCV. Reklamasyon ZXCVFIXVIBETOKEN1ZXCV (odyans lan) idantifye moun k ap resevwa siy ZXCVFIXVIBETOKEN3ZXCV. Si sa yo pa tcheke, sèvè a ka aksepte marqueur ki ekspire oswa ki te fèt pou yon aplikasyon diferan ZXCVFIXVIBETOKEN4ZXCV. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG9 ## Ranje konkrè ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG10 1. Anfòse Siyati Kriptografik: Konfigirasyon aplikasyon an pou rejte nenpòt JWT ki pa sèvi ak yon algorithm siyati solid ki te apwouve davans (tankou RS256). ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG11 2. Valide ekspirasyon: Aplike yon chèk obligatwa pou asire dat ak lè aktyèl la anvan lè ki espesifye nan reklamasyon JWT ZXCVFIXVIBETOKEN1ZXCV. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG12 3. Verifye Odyans lan: Asire w reklamasyon JWT genyen yon valè ki idantifye sèvis lokal la; si sèvis la pa idantifye nan reklamasyon ZXCVFIXVIBETOKEN1ZXCV, siy la dwe rejte ZXCVFIXVIBETOKEN2ZXCV. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG13 4. Anpeche Replay: Sèvi ak JWT (ZXCVFIXVIBETOKEN2ZXCV ID) reklamasyon pou bay yon idantifyan inik nan chak siy, sa ki pèmèt sèvè a swiv ak rejte siy reitilize ZXCVFIXVIBETOKEN1ZXCV. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG14 ## Estrateji Deteksyon ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG15 Yo ka idantifye vilnerabilite nan manyen JWT lè w analize estrikti siy ak konpòtman repons sèvè a: ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG16 * Enspeksyon Header: Tcheke header JWT (algorithm) pou asire ke li pa mete sou "okenn" epi sèvi ak estanda kriptografik ZXCVFIXVIBETOKEN1ZXCV. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG17 * Verifikasyon reklamasyon: Konfime prezans ak validite reklamasyon JWT (ekspiri) ak ZXCVFIXVIBETOKEN1ZXCV (odyans) nan chaj JSON ZXCVFIXVIBETOKEN2ZXCV. ZXCVFIXVIBESEGEN ZXCVFIXVIBESEG18 * Tès Validasyon: Tès si sèvè a kòrèkteman rejte marqueur ki te ekspire dapre reklamasyon JWT oswa ki fèt pou yon lòt odyans jan sa defini nan reklamasyon ZXCVFIXVIBETOKEN1ZXCV ZXCVFIXVIBETOKEN2ZXCV.

JSON Web Tokens (JWTs) provide a standard for transferring claims, but security relies on rigorous validation. Failure to verify signatures, expiration times, or intended audiences allows attackers to bypass authentication or replay tokens.

CWE-347CWE-287CWE-613

Attacker Impact

Improper JWT validation allows attackers to bypass authentication mechanisms by forging claims or reusing expired tokens [S1]. If a server accepts tokens without a valid signature, an attacker can modify the payload to escalate privileges or impersonate any user [S1]. Furthermore, failing to enforce the expiration (exp) claim allows an attacker to use a compromised token indefinitely [S1].

Root Cause

A JSON Web Token (JWT) is a JSON-based structure used to represent claims that are digitally signed or integrity protected [S1]. Security failures typically stem from two primary implementation gaps:

Acceptance of Unsecured JWTs: If a service does not strictly enforce signature verification, it may process "Unsecured JWTs" where the signature is absent and the algorithm is set to "none" [S1]. In this scenario, the server trusts the claims in the payload without verifying their integrity [S1].
Missing Claim Validation: The exp (expiration time) claim identifies the time on or after which the JWT must not be accepted for processing [S1]. The aud (audience) claim identifies the intended recipients of the token [S1]. If these are not checked, the server may accept tokens that are expired or were intended for a different application [S1].

Concrete Fixes

Enforce Cryptographic Signatures: Configure the application to reject any JWT that does not use a pre-approved, strong signing algorithm (such as RS256).
Validate Expiration: Implement a mandatory check to ensure the current date and time are before the time specified in the exp claim [S1].
Verify Audience: Ensure the aud claim contains a value identifying the local service; if the service is not identified in the aud claim, the token must be rejected [S1].
Prevent Replay: Use the jti (JWT ID) claim to assign a unique identifier to each token, allowing the server to track and reject reused tokens [S1].

Detection Strategy

Vulnerabilities in JWT handling can be identified by analyzing the token structure and server response behavior:

Header Inspection: Checking the alg (algorithm) header to ensure it is not set to "none" and uses expected cryptographic standards [S1].
Claim Verification: Confirming the presence and validity of the exp (expiration) and aud (audience) claims within the JSON payload [S1].
Validation Testing: Testing if the server correctly rejects tokens that have expired according to the exp claim or are intended for a different audience as defined by the aud claim [S1].