#VU80916 Observable discrepancy in jose - CVE-2021-29446

Vulnerability identifier: #VU80916

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-29446

CWE-ID: CWE-203

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
jose
Web applications / JS libraries

Vendor: Filip Skokan

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to AES_CBC_HMAC_SHA2 Algorithm (A128CBC-HS256, A192CBC-HS384, A256CBC-HS512) decryption always execute both HMAC tag verification and CBC decryption, if either failed `JWEDecryptionFailed` would be thrown. A remote attacker can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

jose: before 3.11.4, 3.11.4

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External links
https://www.npmjs.com/package/jose-node-cjs-runtime
https://github.com/panva/jose/security/advisories/GHSA-rvcw-f68w-8h8h

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.