Alerts This Week
Warning Icon 1 1,109
Alerts This Week
Warning Icon 1 1,109

Ubuntu 22.04: USN-7588-1 important: gss-ntlmssp denial of service

ubuntu
Calendar Grey June 23, 2025
Dist Ubuntu Esm H88
Upgrade released to mitigate several vulnerabilities in GSS NTLMSSP, impacting Ubuntu distributions and safeguarding overall system security.
Several security issues were fixed in GSS NTLMSSP.

Summary

Several security issues were fixed in GSS NTLMSSP.

Software Description:

- gss-ntlmssp: A mechglue plugin for the GSSAPI library that implements NTLM authentication

Details:

Phil Turnbull discovered that GSS NTLMSSP may perform out-of-bounds reads

when decoding NTLM fields and target information. An attacker could

possibly use this issue to cause GSS NTLMSSP to crash, resulting in

a denial of service. (CVE-2023-25563, CVE-2023-25567)

Phil Turnbull discovered that GSS NTLMSSP did not properly initialize

memory when decoding UTF16 strings. An attacker could possibly use

this issue to trigger an out-of-bounds write, resulting in a crash.

(CVE-2023-25564)

Phil Turnbull discovered that GSS NTLMSSP did not properly handle memory

cleanup. An attacker could possibly use this issue to cause an assertion

failure, resulting in a denial of service. (CVE-2023-25565)

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important memory management gss-ntlmssp

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS
  gss-ntlmssp                     0.7.0-4ubuntu0.22.04.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  gss-ntlmssp                     0.7.0-4ubuntu0.20.04.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  gss-ntlmssp                     0.7.0-4ubuntu0.18.04.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  gss-ntlmssp                     0.7.0-3~ubuntu0.16.04.1+esm1
                                  Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7588-1

CVE-2023-25563, CVE-2023-25564, CVE-2023-25565, CVE-2023-25567

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7588-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important memory management gss-ntlmssp

Package Information

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here