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Ubuntu Security Notice USN-5168-2

Ubuntu Security Notice USN-5168-2
Posted Dec 2, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5168-2 - Tavis Ormandy discovered that NSS, included with Thunderbird, incorrectly handled verifying DSA/RSA-PSS signatures. A remote attacker could use this issue to cause Thunderbird to crash, resulting in a denial of service, or possibly execute arbitrary code.

tags | advisory, remote, denial of service, arbitrary
systems | linux, ubuntu
advisories | CVE-2021-43527
SHA-256 | 2ba4e0a3f2328785f3fe60aa8fec22f213764273dcc7bb558f825a8c4fec28c0

Ubuntu Security Notice USN-5168-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5168-2
December 01, 2021

thunderbird vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.10
- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Thunderbird could be made to crash or run programs if it verified a
specially crafted signature.

Software Description:
- thunderbird: Mozilla Open Source mail and newsgroup client

Details:

Tavis Ormandy discovered that NSS, included with Thunderbird, incorrectly
handled verifying DSA/RSA-PSS signatures. A remote attacker could use this
issue to cause Thunderbird to crash, resulting in a denial of service, or
possibly execute arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 21.10:
thunderbird 1:91.3.1+build1-0ubuntu0.21.10.2

Ubuntu 21.04:
thunderbird 1:78.14.0+build1-0ubuntu0.21.04.2

Ubuntu 20.04 LTS:
thunderbird 1:78.14.0+build1-0ubuntu0.20.04.2

Ubuntu 18.04 LTS:
thunderbird 1:78.14.0+build1-0ubuntu0.18.04.2

After a standard system update you need to restart Thunderbird to make
all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-5168-2
https://ubuntu.com/security/notices/USN-5168-1
CVE-2021-43527

Package Information:
https://launchpad.net/ubuntu/+source/thunderbird/1:91.3.1+build1-0ubuntu0.21.10.2
https://launchpad.net/ubuntu/+source/thunderbird/1:78.14.0+build1-0ubuntu0.21.04.2
https://launchpad.net/ubuntu/+source/thunderbird/1:78.14.0+build1-0ubuntu0.20.04.2
https://launchpad.net/ubuntu/+source/thunderbird/1:78.14.0+build1-0ubuntu0.18.04.2
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