SB2023092525 - Denial of service in GNU glibc

Description

This security bulletin contains information about 1 security vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2023-4527)

The vulnerability allows a remote attacker to gain access to potentially sensitive information or perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition within the getaddrinfo() function called with the AF_UNSPEC address family. A remote attacker with control over DNS server can send a DNS response via TCP larger than 2048 bytes, trigger an out-of-bounds read and crash the application or gain access to potentially sensitive information.

Successful exploitation of the vulnerability requires that system is configured with no-aaaa mode via /etc/resolv.conf.

Remediation

Cybersecurity Help is not aware of any official remediation provided by the vendor.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=2234712
• https://sourceware.org/bugzilla/show_bug.cgi?id=30842