Description
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.
Metrics
CVSS 3.1 7.5/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.0, < V3.1.5 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.htmlMailing List, Third Party Advisory
- https://gitlab.com/gnutls/gnutls/-/issues/1071Exploit, Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/
- https://security.gentoo.org/glsa/202009-01Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200911-0006/Third Party Advisory
- https://usn.ubuntu.com/4491-1/Third Party Advisory
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.htmlMailing List, Third Party Advisory
- https://gitlab.com/gnutls/gnutls/-/issues/1071Exploit, Issue Tracking, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/
- https://security.gentoo.org/glsa/202009-01Third Party Advisory
- https://security.netapp.com/advisory/ntap-20200911-0006/Third Party Advisory
- https://usn.ubuntu.com/4491-1/Third Party Advisory
- https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-09-04Vendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
Timeline
- Published
- Sep 4, 2020
- Last modified
- Oct 14, 2026
- NVD status
- Modified