Vulnerability Details : CVE-2023-31147
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.
Products affected by CVE-2023-31147
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*
- cpe:2.3:a:c-ares_project:c-ares:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-31147
0.33%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 54 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-31147
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
3.9
|
2.5
|
NIST | |
|
5.9
|
MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N |
2.2
|
3.6
|
GitHub, Inc. |
CWE ids for CVE-2023-31147
-
The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.Assigned by:
- nvd@nist.gov (Secondary)
- security-advisories@github.com (Primary)
References for CVE-2023-31147
-
https://security.gentoo.org/glsa/202310-09
c-ares: Multiple Vulnerabilities (GLSA 202310-09) — Gentoo securityThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/
[SECURITY] Fedora 37 Update: c-ares-1.19.1-1.fc37 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1
Release 1.19.1 · c-ares/c-ares · GitHubRelease Notes
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
[SECURITY] Fedora 38 Update: c-ares-1.19.1-1.fc38 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2
Insufficient randomness in generation of DNS query IDs · Advisory · c-ares/c-ares · GitHubThird Party Advisory
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