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.

Weakness classification

• security-advisories@github.com: CWE-330
• nvd@nist.gov: CWE-330

Primary references

• security-advisories@github.com — Release Notes
• security-advisories@github.com — Third Party Advisory
• security-advisories@github.com — Mailing List, Third Party Advisory
• security-advisories@github.com — Mailing List, Third Party Advisory
• security-advisories@github.com — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Mailing List, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory