Vulnerability Details : CVE-2023-37464
Potential exploit
OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). The AES GCM decryption routine incorrectly uses the Tag length from the actual Authentication Tag provided in the JWE. The spec says that a fixed length of 16 octets must be applied. Therefore this bug allows an attacker to provide a truncated Authentication Tag and to modify the JWE accordingly. Users should upgrade to a version >= 0.6.2.2. Users unable to upgrade should avoid using AES GCM encryption and replace it with another encryption algorithm (e.g. AES CBC).
Products affected by CVE-2023-37464
- cpe:2.3:a:cisco:cjose:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-37464
0.58%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 67 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-37464
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST | |
|
8.6
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N |
3.9
|
4.0
|
GitHub, Inc. |
CWE ids for CVE-2023-37464
-
The product uses a broken or risky cryptographic algorithm or protocol.Assigned by: security-advisories@github.com (Primary)
References for CVE-2023-37464
-
https://www.debian.org/security/2023/dsa-5472
Debian -- Security Information -- DSA-5472-1 cjose
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https://lists.debian.org/debian-lts-announce/2023/08/msg00002.html
[SECURITY] [DLA 3515-1] cjose security update
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https://datatracker.ietf.org/doc/html/rfc7518#section-4.7
RFC 7518 - JSON Web Algorithms (JWA)Third Party Advisory
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DFWAPMYYVBO2U65HPYDTBEKNSXG4TP5C/
[SECURITY] Fedora 37 Update: cjose-0.6.2.2-2.fc37 - package-announce - Fedora Mailing-Lists
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PTZHOVGY7AHGNMEY245HK4Q36AMA53AL/
[SECURITY] Fedora 38 Update: cjose-0.6.2.2-2.fc38 - package-announce - Fedora Mailing-Lists
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https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LCQJXKDPCWCXB2V4JMQ3UWYJ4UIBPUW6/
[SECURITY] Fedora 39 Update: cjose-0.6.2.2-2.fc39 - package-announce - Fedora Mailing-Lists
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https://github.com/OpenIDC/cjose/security/advisories/GHSA-3rhg-3gf2-6xgj
incorrect Authentication Tag length usage in AES GCM decryption · Advisory · OpenIDC/cjose · GitHubExploit;Patch;Vendor Advisory
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https://github.com/OpenIDC/cjose/releases/tag/v0.6.2.2
Release release v0.6.2.2 · OpenIDC/cjose · GitHubRelease Notes
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https://github.com/OpenIDC/cjose/commit/7325e9a5e71e2fc0e350487ecac7d84acdf0ed5e
use fixed authentication tag length of 16 octets in AES GCM decryption · OpenIDC/cjose@7325e9a · GitHubPatch
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