CVE-2023-31147 Information

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.

Reference

https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2 https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1