glibc getaddrinfo NPE after NSS module missing gethostbyname3
CVE-2023-4806 Published on September 18, 2023

Glibc: potential use-after-free in getaddrinfo()
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.

Vendor Advisory Vendor Advisory Vendor Advisory Vendor Advisory NVD

Vulnerability Analysis

CVE-2023-4806 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
HIGH
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Timeline

Reported to Red Hat.

Made public. 6 days later.

Weakness Type

What is a Dangling pointer Vulnerability?

Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.

CVE-2023-4806 has been classified to as a Dangling pointer vulnerability or weakness.


Products Associated with CVE-2023-4806

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2023-4806 are published in these products:

GNU Glibc
 
Red Hat Enterprise Linux (RHEL)
 
Red Hat Enterprise Linux Eus
 
Red Hat Enterprise Linux Server Aus
 
Red Hat Enterprise Linux Power Little Endian
 
Red Hat Enterprise Linux Power Little Endian Eus
 
Red Hat Enterprise Linux Ibm Z Systems S390x
 
Red Hat Enterprise Linux Ibm Z Systems Eus S390x
 
Red Hat Enterprise Linux Tus
 
Red Hat Codeready Linux Builder Arm64 Eus
 
Red Hat Codeready Linux Builder Ibm Z Systems Eus
 
Red Hat Codeready Linux Builder Eus Power Little Endian
 
Red Hat Codeready Linux Builder Ibm Z Systems
 
Red Hat Codeready Linux Builder Arm64
 
Red Hat Codeready Linux Builder Eus Power Little Endian Eus
 
Red Hat Codeready Linux Builder Eus
 
Red Hat Enterprise Linux Server Power Little Endian Update Services Sap Solutions
 
Red Hat Enterprise Linux Arm 64 Eus
 
Red Hat Enterprise Linux For Arm 64
 
Red Hat Enterprise Linux Ibm Z Systems Eus
 
Red Hat Enterprise Linux Ibm Z Systems
 
Fedora Project Fedora
 
Canonical Ubuntu Linux
 
Red Hat Rhel Eus
 
Red Hat Rhev Hypervisor
 

Affected Versions

Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 8.6 Extended Update Support: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Enterprise Linux 9: Red Hat Virtualization 4 for Red Hat Enterprise Linux 8: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 6: Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 7:

Exploit Probability

EPSS
1.95%
Percentile
83.19%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.