Security Advisory

CVE-2023-31147

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2023-05-25 21:55:47

Last updated 2025-02-13 16:49:46

Assigner GitHub_M

State PUBLISHED

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.

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