CVE-2020-24659
An issue was discovered in GnuTLS before 3.6.15. A server can trigger a NULL pointer dereference in a TLS 1.3 client if a no_renegotiation alert is sent with unexpected timing, and then an invalid second handshake occurs. The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.
- Score
- CVSS 3.1 7.5 High
- Status
- Modified - cve@mitre.org
- Published
- 2020-09-04
- Last modified
- 2026-10-14
- Weaknesses
- CWE-476, CWE-787
Affected products
- Ubuntu Linux (Canonical)
- Fedora (Fedoraproject)
- Gnutls (Gnu)
- Leap (Opensuse)
- Simatic S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
- Simatic S7-1500 Cpu 1518f-4 Pndp Mfp (Siemens)
- Siplus S7-1500 Cpu 1518-4 Pndp Mfp (Siemens)
References
- https://gitlab.com/gnutls/gnutls/-/issues/1071
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04
- https://security.gentoo.org/glsa/202009-01
- https://security.netapp.com/advisory/ntap-20200911-0006/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZ…
- https://usn.ubuntu.com/4491-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TY…
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
