CVE-2020-24659
The crash happens in the application's error handling path, where the gnutls_deinit function is called after detecting a handshake failure.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.73%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 3.73% probability · 89th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476, CWE-787
- Affected
- gnu/gnutls · fedoraproject/fedora · opensuse/leap · canonical/ubuntu linux
- Source
- cve@mitre.org
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.