Vulnerability identifier: #VU18106

Vulnerability risk: Medium

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-3836

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GnuTLS
Universal components / Libraries / Libraries used by multiple products

Vendor: GnuTLS

Description

The vulnerability allows a remote attacker to perform denial of service attack.

The vulnerability exists due to uninitialized pointer access when processing TLS1.3 asynchronous messages. A remote attacker can pass specially crafted asynchronous post-handshake message, trigger memory corruption and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GnuTLS: 3.6.4 - 3.6.6

---

External links
http://www.gnutls.org/security-new.html#GNUTLS-SA-2019-03-27
http://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3836
http://gitlab.com/gnutls/gnutls/issues/704

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.