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.

CVSS v3.0 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

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

Configurations

Configuration 1 (hide)

cpe:2.3:a:gnu:gnutls:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*

Information

Published : 2020-09-04 15:15

Updated : 2020-10-26 16:15

NVD link : CVE-2020-24659

Mitre link : CVE-2020-24659

JSON object : View

Products Affected

fedoraproject

fedora

gnu

gnutls

CWE

CWE-787

Out-of-bounds Write

CWE-476

NULL Pointer Dereference

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