Buffer Over-read in tnef - CVE-2019-18849
Published: November 11, 2019
Vulnerability identifier: #VU22642
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-18849
CWE-ID: CWE-126
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the heap-based buffer over-read involving strdup. A remote attacker can write to the victim's ".ssh/authorized_keys" file via an e-mail message with a crafted winmail.dat application/ms-tnef attachment and crash the application.
Affected software
tnef
Fedora
Ubuntu
tnef (Ubuntu package)
tnef
Fedora
Ubuntu
tnef (Ubuntu package)
tnef
How to mitigate CVE-2019-18849
Install updates from vendor's website.
tnef - update to 1.4.18
tnef (Ubuntu package) - update to 1.4.9-1+deb8u4build0.16.04.1
tnef - addressed in versions 1.4.18-1.el6, 1.4.18-1.el7, 1.4.18-1.fc30, 1.4.18-1.fc31
tnef (Ubuntu package) - update to 1.4.9-1+deb8u4build0.16.04.1
tnef - addressed in versions 1.4.18-1.el6, 1.4.18-1.el7, 1.4.18-1.fc30, 1.4.18-1.fc31