CVEvulnerability

CVE-2023-31147

6.5 MEDIUM Published 2023-05-25 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2023-05-25
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.9 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-330

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.

Affected configurations

• c-ares project c-ares (< 1.19.1) • fedoraproject fedora 37 • fedoraproject fedora 38

Related

Weakness · CWE (1)

  • CWE-330 Use of Insufficiently Random Values weakness

References