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CVE-2020-24659

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-4491-1
Posted Sep 9, 2020
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4491-1 - It was discovered that GnuTLS incorrectly handled certain alerts when being used with TLS 1.3 servers. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2020-24659
MD5 | 850846219cfdc31cd7162b083b8e91e8
Gentoo Linux Security Advisory 202009-01
Posted Sep 6, 2020
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202009-1 - A flaw was found in GnuTLS, possibly allowing a Denial of Service condition. Versions less than 3.6.15 are affected.

tags | advisory, denial of service
systems | linux, gentoo
advisories | CVE-2020-24659
MD5 | bb2922f1bbc0d9ea640f78d76b993003
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