CVE-2023-25565 GSS-NTLMSSP vulnerable to incorrect free when decoding target information
An attacker can cause a denial of service in applications using GSS-NTLMSSP by triggering an incorrect free operation during NTLM authentication decoding.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-25565?
CVE-2023-25565 is a high-severity memory corruption vulnerability in gssapi gss-ntlmssp, published on 14 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, an incorrect free when decoding target information can trigger a denial of service. The error condition incorrectly assumes the `cb` and `sh` buffers contain a copy of the data that needs to be freed. However, that is not the case. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point. This will likely trigger an assertion failure in `free`, causing a denial-of-service. This issue is fixed in version 1.2.0.
Which versions are affected by CVE-2023-25565?
It affects 1 product.
Products include Gss-Ntlmssp Project Gss-Ntlmssp.
How do I fix CVE-2023-25565?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-25565 being exploited?
There is no known exploitation of CVE-2023-25565 in the wild and no public exploit code.
Other vulnerabilities in gssapi gss-ntlmssp
- CVE-2023-25566 GSS-NTLMSSP vulnerable to memory leak when parsing usernames
- CVE-2023-25567 GSS-NTLMSSP vulnerable to out-of-bounds read when decoding target information
- CVE-2023-25564 GSS-NTLMSSP vulnerable to memory corruption when decoding UTF16 strings
- CVE-2023-25563 GSS-NTLMSSP vulnerable to multiple out-of-bounds reads when decoding NTLM fields
Sources
Also known as AZL-43606, AZL-45279, DEBIAN-CVE-2023-25565, GHSA-7q7f-wqcg-mvfg, ROOT-OS-UBUNTU-2204-CVE-2023-25565, UBUNTU-CVE-2023-25565.