Medium severity · published May 25, 2023
CVE-2023-31147
c-ares is an asynchronous resolver library
6.5
CVSS
0.9%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.9% · higher than 59% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CA
C-ares · C-ares Project
before 1.19.1 · source: NVD
FE
Fedora · Fedoraproject
37; 38 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-31147
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-31147
Release Notes
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1
Third Party Advisory
https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UBFWILTA33LOSV23P44FGTQQIDRJHIY7/
Third Party Advisory
https://security.gentoo.org/glsa/202310-09
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