CVE-2023-31147
MEDIUM EPSS 55.3%
Published May 25, 20233y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Published May 25, 2023 3y ago
Last Modified Jun 17, 2026 2w ago
Description
c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Low
Integrity Low
Availability None
Threat Intelligence
EPSS Exploit Probability
55.3% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-330
Affected Products 3
| Vendor | Product | Version | Range |
|---|---|---|---|
| c-ares_project | c-ares | * | <1.19.1 |
| fedoraproject | fedora | 37 | any |
| fedoraproject | fedora | 38 | any |
References 5
- github.com https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1
- github.com https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2
- lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
- lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/
- security.gentoo.org https://security.gentoo.org/glsa/202310-09
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.