CVE-2023-4806
MEDIUM severity · CVSS 5.9 · Use-after-free
5.9CVSS MEDIUM
Summary
A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit probability (EPSS)1%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://access.redhat.com/errata/RHBA-2024:2413
- https://access.redhat.com/errata/RHSA-2023:5453Advisory
- https://access.redhat.com/errata/RHSA-2023:5455Advisory
- https://access.redhat.com/errata/RHSA-2023:7409
- https://access.redhat.com/security/cve/CVE-2023-4806Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2237782Advisory
- http://www.openwall.com/lists/oss-security/2023/10/03/4
- http://www.openwall.com/lists/oss-security/2023/10/03/5