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. https://github.com/gssapi/gss-ntlmssp/commit/97c62c6167299028d80765080e74d91dfc99efbd https://github.com/gssapi/gss-ntlmssp/releases/tag/v1.2.0 https://github.com/gssapi/gss-ntlmssp/security/advisories/GHSA-jjjx-5qf7-9mgf
Created gssntlmssp tracking bugs for this issue: Affects: epel-7 [bug 2172024]
Created gssntlmssp tracking bugs for this issue: Affects: fedora-all [bug 2175088]
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2023:3097 https://access.redhat.com/errata/RHSA-2023:3097
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2023-25563