CVE-2023-25567 GSS-NTLMSSP vulnerable to out-of-bounds read when decoding target information
An out-of-bounds read in GSS-NTLMSSP allows attackers to cause a denial of service via crafted target information during authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-25567?
CVE-2023-25567 is a high-severity denial of service 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, a mechglue plugin for the GSSAPI library that implements NTLM authentication, has an out-of-bounds read when decoding target information prior to version 1.2.0. The length of the `av_pair` is not checked properly for two of the elements which can trigger an out-of-bound read. The out-of-bounds read can be triggered via the main `gss_accept_sec_context` entry point and could cause a denial-of-service if the memory is unmapped. The issue is fixed in version 1.2.0.
Weakness: CWE-125
Which versions are affected by CVE-2023-25567?
It affects 1 product.
Products include Gss-Ntlmssp Project Gss-Ntlmssp.
How do I fix CVE-2023-25567?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-25567 being exploited?
There is no known exploitation of CVE-2023-25567 in the wild and no public exploit code.
Other vulnerabilities in gssapi gss-ntlmssp
- CVE-2023-25565 GSS-NTLMSSP vulnerable to incorrect free when decoding target information
- CVE-2023-25566 GSS-NTLMSSP vulnerable to memory leak when parsing usernames
- 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-43771, AZL-44844, DEBIAN-CVE-2023-25567, GHSA-24pf-6prf-24ch, UBUNTU-CVE-2023-25567.