Spoofing attack in Mozilla Thunderbird - CVE-2019-11755
Published: September 26, 2019
Vulnerability identifier: #VU21371
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-11755
CWE-ID: CWE-451
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to incorrect processing of S/MIME messages, consisting of an inner encryption layer and an outer SignedData layeruser-supplied data. A remote attacker can create a specially crafted message and make it look as it was signed with a valid signature. Although the signer might have had no access to the contents of the encrypted message, and might have stripped a different signature from the encrypted message.
Affected software
Mozilla Thunderbird
Slackware Linux
thunderbird (Ubuntu package)
thunderbird (Debian package)
Slackware Linux
thunderbird (Ubuntu package)
thunderbird (Debian package)
How to mitigate CVE-2019-11755
Install updates from vendor's website.
Mozilla Thunderbird - update to 68.1.1
thunderbird (Ubuntu package) - addressed in versions 1:68.2.1+build1-0ubuntu0.18.04.1, 1:68.2.1+build1-0ubuntu0.19.10.1, 1:68.2.2+build1-0ubuntu0.18.04.1, 1:68.2.2+build1-0ubuntu0.19.10.1, 1:68.7.0+build1-0ubuntu0.16.04.2
thunderbird (Debian package) - addressed in versions 1:68.2.2-1~deb9u1, 1:68.2.2-1~deb10u1
thunderbird (Ubuntu package) - addressed in versions 1:68.2.1+build1-0ubuntu0.18.04.1, 1:68.2.1+build1-0ubuntu0.19.10.1, 1:68.2.2+build1-0ubuntu0.18.04.1, 1:68.2.2+build1-0ubuntu0.19.10.1, 1:68.7.0+build1-0ubuntu0.16.04.2
thunderbird (Debian package) - addressed in versions 1:68.2.2-1~deb9u1, 1:68.2.2-1~deb10u1