cve/2023/CVE-2023-25563.md

### [CVE-2023-25563](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-25563)
![](https://img.shields.io/static/v1?label=Product&message=gss-ntlmssp&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%201.2.0%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-125%3A%20Out-of-bounds%20Read&color=brighgreen)

### 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.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/emotest1/emo_emo