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CVE-2023-31147

Insufficient randomness in generation of DNS query IDs in c-ares

Published: May 25, 2023Updated: Nov 21, 2024 Sources: CVE List NVD csafCWE-330
NVD MITRE
5.9CVSSMEDIUM
EPSS Score
0.9%
Top 45.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Breakdown

AV:NAC:HPR:NUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-330

Affected Products

c-aresc-ares
Library
OSS Libraries / generic-library
c-aresc-ares project
Library
OSS Libraries / generic-library
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
c-aresoss-projectOSS Libraries
c-ares projectoss-projectUSOSS Librariesaka c-ares
fedoraprojectoss-projectUSOperating Systemsaka fedora project

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Credential Access
View detailed technique mapping

References

https://github.com/c-ares/c-ares/security/advisories/GHSA-8r8p-23f3-64c2
github.com
https://github.com/c-ares/c-ares/releases/tag/cares-1_19_1
github.com
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/B5Z5XFNXTNPTCBBVXFDNZQVLLIE6VRBY/
lists.fedoraproject.org
and 14 more references View all →

Timeline

Published
May 25, 2023
Last Updated
Nov 21, 2024

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