CVE-2020-24659 Information

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 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00054.html http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00060.html https://gitlab.com/gnutls/gnutls/-/issues/1071 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/62BUAI4FQQLG6VTKRT7SUZPGJJ4NASQ3/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AWN56FDLQQXT2D2YHNI4TYH432TDMQ7N/ https://security.gentoo.org/glsa/202009-01 https://security.netapp.com/advisory/ntap-20200911-0006/ https://usn.ubuntu.com/4491-1/ https://www.gnutls.org/security-new.htmlGNUTLS-SA-2020-09-04

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5