Red Hat: CVE-2023-25563: multiple out-of-bounds read when decoding NTLM fields (Multiple Advisories)

Red Hat: CVE-2023-25563: multiple out-of-bounds read when decoding NTLM fields (Multiple Advisories)

Severity

8

CVSS

(AV:N/AC:L/Au:N/C:N/I:N/A:C)

Published

02/14/2023

Created

05/17/2023

Added

05/17/2023

Modified

01/28/2025

Description

GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, multiple out-of-bounds reads when decoding NTLM fields can trigger a denial of service. A 32-bit integer overflow condition can lead to incorrect checks of consistency of length of internal buffers. Although most applications will error out before accepting a singe input buffer of 4GB in length this could theoretically happen. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point if the application allows tokens greater than 4GB in length. This can lead to a large, up to 65KB, out-of-bounds read which could cause a denial-of-service if it reads from unmapped memory. Version 1.2.0 contains a patch for the out-of-bounds reads.

Solution(s)

• redhat-upgrade-gssntlmssp
• redhat-upgrade-gssntlmssp-debuginfo
• redhat-upgrade-gssntlmssp-debugsource

References

• CVE-2023-25563
• RHSA-2023:3097