Buffer overflow in GnuTLS - CVE-2019-3836
Published: April 1, 2019
Vulnerability identifier: #VU18106
CSH Severity: Medium
CVSS v4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-3836
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
GnuTLS
Gentoo Linux
Red Hat Enterprise Linux for x86_64
Opensuse
Fedora
gnutls28 (Ubuntu package)
gnutls (Alpine package)
gnutls
Gentoo Linux
Red Hat Enterprise Linux for x86_64
Opensuse
Fedora
gnutls28 (Ubuntu package)
gnutls (Alpine package)
gnutls
How to mitigate CVE-2019-3836
Install updates from vendor's website.
GnuTLS - update to 3.6.7
gnutls28 (Ubuntu package) - addressed in versions 3.4.10-4ubuntu1.5, 3.5.18-1ubuntu1.1, 3.6.4-2ubuntu1.2, 3.6.5-2ubuntu1.1
gnutls (Alpine package) - update to 3.6.7-r0
gnutls - addressed in versions 3.6.5-3.fc28, 3.6.7-1.fc29, 3.6.7-1.fc30
gnutls28 (Ubuntu package) - addressed in versions 3.4.10-4ubuntu1.5, 3.5.18-1ubuntu1.1, 3.6.4-2ubuntu1.2, 3.6.5-2ubuntu1.1
gnutls (Alpine package) - update to 3.6.7-r0
gnutls - addressed in versions 3.6.5-3.fc28, 3.6.7-1.fc29, 3.6.7-1.fc30