Use of Insufficiently Random Values Affecting c-ares-devel package, versions <0:1.19.1-1.amzn2.0.1


Severity

Recommended
0.0
medium
0
10

Based on Amazon Linux security rating.

Threat Intelligence

EPSS
0.14% (51st percentile)

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  • Snyk IDSNYK-AMZN2-CARESDEVEL-8161156
  • published3 Oct 2024
  • disclosed25 May 2023

Introduced: 25 May 2023

CVE-2023-31147  (opens in a new tab)
CWE-330  (opens in a new tab)

How to fix?

Upgrade Amazon-Linux:2 c-ares-devel to version 0:1.19.1-1.amzn2.0.1 or higher.
This issue was patched in ALAS2-2024-2646.

NVD Description

Note: Versions mentioned in the description apply only to the upstream c-ares-devel package and not the c-ares-devel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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.

CVSS Scores

version 3.1