Bug 2172019 (CVE-2023-25563)

Summary: CVE-2023-25563 gssntlmssp: multiple out-of-bounds read when decoding NTLM fields
Product: [Other] Security Response Reporter: TEJ RATHI <trathi>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: jrische
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: gssntlmssp 1.2.0 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in GSS-NTLMSSP, a mechglue plugin for the GSSAPI library that implements NTLM authentication. Multiple out-of-bounds reads occur when decoding NTLM fields and can trigger a denial of service. A 32-bit integer overflow condition can lead to incorrect checks of the consistency of the length of internal buffers. Although most applications will error out before accepting a single input buffer of 4GB in length, this issue can 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, leading to a large, up to 65KB, out-of-bounds read, which could cause a denial of service if it reads from unmapped memory.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2023-05-17 03:11:27 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2172024, 2175088, 2178907, 2181313    
Bug Blocks: 2169915    

Description TEJ RATHI 2023-02-21 08:50:26 UTC 
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
Comment 1 TEJ RATHI 2023-02-21 08:50:46 UTC 
Created gssntlmssp tracking bugs for this issue:

Affects: epel-7 [bug 2172024]
Comment 2 Sandipan Roy 2023-03-03 07:52:34 UTC 
Created gssntlmssp tracking bugs for this issue:

Affects: fedora-all [bug 2175088]
Comment 4 errata-xmlrpc 2023-05-16 10:00:58 UTC 
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
Comment 5 Product Security DevOps Team 2023-05-17 03:11:25 UTC 
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