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CVE-2023-4806

MEDIUMCVSS 5.9/10EPSS 1.44%

Last modified

CVE-2023-4806 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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. EPSS estimates a 1.44% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
5.9/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
1.44%

69.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
GnuGlibc2.33
RedhatCodeready Linux Builder Eus9.2
RedhatCodeready Linux Builder Eus For Power Little Endian9.0_ppc64le
RedhatCodeready Linux Builder Eus For Power Little Endian Eus9.2_ppc64le
RedhatCodeready Linux Builder For Arm649.0_aarch64
RedhatCodeready Linux Builder For Arm64 Eus9.2_aarch64
RedhatCodeready Linux Builder For Ibm Z Systems9.0_s390x
RedhatCodeready Linux Builder For Ibm Z Systems Eus9.2_s390x
RedhatEnterprise Linux7.0
RedhatEnterprise Linux8.0
RedhatEnterprise Linux9.0
RedhatEnterprise Linux Eus8.8
RedhatEnterprise Linux Eus9.2
RedhatEnterprise Linux For Arm 649.0_aarch64
RedhatEnterprise Linux For Arm 64 Eus9.2_aarch64
RedhatEnterprise Linux For Ibm Z Systems8.0_s390x
RedhatEnterprise Linux For Ibm Z Systems Eus8.8_s390x
RedhatEnterprise Linux For Ibm Z Systems Eus S390x9.2
RedhatEnterprise Linux For Ibm Z Systems S390x9.2
RedhatEnterprise Linux For Power Little Endian8.0_ppc64le
RedhatEnterprise Linux For Power Little Endian9.2_ppc64le
RedhatEnterprise Linux For Power Little Endian Eus8.8_ppc64le
RedhatEnterprise Linux For Power Little Endian Eus9.2_ppc64le
RedhatEnterprise Linux Server Aus9.2
RedhatEnterprise Linux Server For Power Little Endian Update Services For Sap Solutions9.2_ppc64le
RedhatEnterprise Linux Tus8.8
FedoraprojectFedora37
FedoraprojectFedora38
FedoraprojectFedora39

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2023-4806?
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.
How severe is CVE-2023-4806?
CVE-2023-4806 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 1.44% probability of exploitation in the next 30 days.
How do I fix CVE-2023-4806?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-4806?

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Source: NVD / NIST