Vulnerability CVE-2020-11501
Published: 2020-04-03

Description:
GnuTLS 3.6.x before 3.6.13 uses incorrect cryptography for DTLS. The earliest affected version is 3.6.3 (2018-07-16) because of an error in a 2017-10-06 commit. The DTLS client always uses 32 '\0' bytes instead of a random value, and thus contributes no randomness to a DTLS negotiation. This breaks the security guarantees of the DTLS protocol.

Type:

CWE-327

 (Use of a Broken or Risky Cryptographic Algorithm)

CVSS2 => (AV:N/AC:L/Au:N/C:P/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.4/10
4.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
None
Affected software
Gnutls -> Gnutls 
Debian -> Debian linux 

 References:
http://lists.opensuse.org/opensuse-security-announce/2020-04/msg00015.html
https://gitlab.com/gnutls/gnutls/-/commit/5b595e8e52653f6c5726a4cdd8fddeb6e83804d2
https://gitlab.com/gnutls/gnutls/-/issues/960
https://www.debian.org/security/2020/dsa-4652
https://www.gnutls.org/security-new.html#GNUTLS-SA-2020-03-31
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