{"id":"UBUNTU-CVE-2023-25563","details":"GSS-NTLMSSP is a mechglue plugin for the GSSAPI library that implements NTLM authentication. Prior to version 1.2.0, multiple out-of-bounds reads when decoding NTLM fields can trigger a denial of service. A 32-bit integer overflow condition can lead to incorrect checks of consistency of length of internal buffers. Although most applications will error out before accepting a singe input buffer of 4GB in length this could theoretically happen. This vulnerability can be triggered via the main `gss_accept_sec_context` entry point if the application allows tokens greater than 4GB in length. This can lead to a large, up to 65KB, out-of-bounds read which could cause a denial-of-service if it reads from unmapped memory. Version 1.2.0 contains a patch for the out-of-bounds reads.","modified":"2026-04-22T16:37:56.377650Z","published":"2023-02-14T18:15:00Z","related":["USN-7588-1"],"upstream":["CVE-2023-25563"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-25563"},{"type":"REPORT","url":"https://github.com/gssapi/gss-ntlmssp/security/advisories/GHSA-jjjx-5qf7-9mgf"},{"type":"REPORT","url":"https://github.com/gssapi/gss-ntlmssp/commit/97c62c6167299028d80765080e74d91dfc99efbd"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2023-25563"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7588-1"}],"affected":[{"package":{"name":"gss-ntlmssp","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/gss-ntlmssp@0.7.0-3~ubuntu0.16.04.1+esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.0-3~ubuntu0.16.04.1+esm1"}]}],"versions":["0.6.0-1","0.7.0-3~ubuntu0.16.04.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"gss-ntlmssp","binary_version":"0.7.0-3~ubuntu0.16.04.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-25563.json"}},{"package":{"name":"gss-ntlmssp","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/gss-ntlmssp@0.7.0-4ubuntu0.18.04.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.0-4ubuntu0.18.04.1~esm1"}]}],"versions":["0.7.0-3","0.7.0-4","0.7.0-4build1","0.7.0-4build3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"gss-ntlmssp","binary_version":"0.7.0-4ubuntu0.18.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-25563.json"}},{"package":{"name":"gss-ntlmssp","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/gss-ntlmssp@0.7.0-4ubuntu0.20.04.1~esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.0-4ubuntu0.20.04.1~esm1"}]}],"versions":["0.7.0-4build3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"gss-ntlmssp","binary_version":"0.7.0-4ubuntu0.20.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-25563.json"}},{"package":{"name":"gss-ntlmssp","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/gss-ntlmssp@0.7.0-4ubuntu0.22.04.1~esm1?arch=source&distro=esm-apps/jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7.0-4ubuntu0.22.04.1~esm1"}]}],"versions":["0.7.0-4build3","0.7.0-4build4"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"gss-ntlmssp","binary_version":"0.7.0-4ubuntu0.22.04.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2023/UBUNTU-CVE-2023-25563.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}