Vulnerability · Published Feb 14, 2023 · Assigned by GitHub_M
CVE-2023-25563GSS-NTLMSSP vulnerable to multiple out-of-bounds reads when decoding NTLM fields
Medium 5.9
In plain English
A medium-severity out-of-bounds read in gss-ntlmssp from gssapi. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | gssntlmssp | 1.2.0-1.el8_8 | ALSA-2023:3097 |
| Debian:12 | gss-ntlmssp | 1.2.0-1 | DEBIAN-CVE-2023-25563 |
| Debian:13 | gss-ntlmssp | 1.2.0-1 | DEBIAN-CVE-2023-25563 |
| Debian:14 | gss-ntlmssp | 1.2.0-1 | DEBIAN-CVE-2023-25563 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| gssapi | gss-ntlmssp | < 1.2.0 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H