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Red Hat: CVE-2023-25564: memory corruption when decoding UTF16 strings (Multiple Advisories)

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Red Hat: CVE-2023-25564: memory corruption when decoding UTF16 strings (Multiple Advisories)

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
02/14/2023
Created
05/17/2023
Added
05/17/2023
Modified
12/15/2023

Description

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.

Solution(s)

  • redhat-upgrade-gssntlmssp
  • redhat-upgrade-gssntlmssp-debuginfo
  • redhat-upgrade-gssntlmssp-debugsource

References

  • CVE-2023-25564
  • RHSA-2023:3097

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