Bug 2172020 (CVE-2023-25564) - CVE-2023-25564 gssntlmssp: memory corruption when decoding UTF16 strings
Summary: CVE-2023-25564 gssntlmssp: memory corruption when decoding UTF16 strings
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2023-25564
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2172025 2175083 2178907 2181313
Blocks: 2169915
TreeView+ depends on / blocked
 
Reported: 2023-02-21 08:50 UTC by TEJ RATHI
Modified: 2023-05-17 03:42 UTC (History)
1 user (show)

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. Memory corruption can be triggered when decoding UTF16 strings. The variable `outlen` was not initialized and could cause writing a zero to an arbitrary place in memory if the `ntlm_str_convert()` fails, which would leave `outlen` uninitialized. This issue can lead to a denial of service if the write hits unmapped memory or randomly corrupts a byte in the application memory space. This vulnerability can trigger an out-of-bounds write, leading to memory corruption, and can be triggered via the main `gss_accept_sec_context` entry point.
Clone Of:
Environment:
Last Closed: 2023-05-17 03:42:09 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2023:3097 0 None None None 2023-05-16 10:01:02 UTC

Description TEJ RATHI 2023-02-21 08:50:28 UTC 
GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, memory corruption can be triggered when decoding UTF16 strings. The variable `outlen` was not initialized and could cause writing a zero to an arbitrary place in memory if `ntlm_str_convert()` were to fail, which would leave `outlen` uninitialized. This can lead to a denial of service if the write hits unmapped memory or randomly corrupts a byte in the application memory space. This vulnerability can trigger an out-of-bounds write, leading to memory corruption. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point. This issue is fixed in version 1.2.0.

https://github.com/gssapi/gss-ntlmssp/commit/c753000eb31835c0664e528fbc99378ae0cbe950
https://github.com/gssapi/gss-ntlmssp/releases/tag/v1.2.0
https://github.com/gssapi/gss-ntlmssp/security/advisories/GHSA-r85x-q5px-9xfq
Comment 1 TEJ RATHI 2023-02-21 08:50:50 UTC 
Created gssntlmssp tracking bugs for this issue:

Affects: epel-7 [bug 2172025]
Comment 2 Sandipan Roy 2023-03-03 07:51:15 UTC 
Created gssntlmssp tracking bugs for this issue:

Affects: fedora-all [bug 2175083]
Comment 4 errata-xmlrpc 2023-05-16 10:01:01 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 03:42:07 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-2023-25564
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