Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| C-Ares Project | C-Ares | < 1.19.1 |
| Fedoraproject | Fedora | 37 |
Related Weaknesses (CWE)
References
- https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1Release Notes
- https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2Third Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202310-09Third Party Advisory
- https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1Release Notes
- https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2Third Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/[email protected]Mailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202310-09Third Party Advisory
FAQ
What is CVE-2023-31147?
CVE-2023-31147 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 a...
How severe is CVE-2023-31147?
CVE-2023-31147 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-31147?
Check the references section above for vendor advisories and patch information. Affected products include: C-Ares Project C-Ares, Fedoraproject Fedora.