CVE-2023-31147
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.
How to fix
- c-ares_project c-ares1.19.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| c-ares_project c-ares | v < 1.19.1 | 1.19.1 |
| fedoraproject fedora | 37, 38 | — |
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