USN-4202-1: Thunderbird vulnerabilities

26 November 2019

thunderbird vulnerabilities

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

  • Ubuntu 19.10
  • Ubuntu 18.04 LTS

Summary

Several security issues were fixed in Thunderbird.

Software Description

  • thunderbird - Mozilla Open Source mail and newsgroup client

Details

It was discovered that a specially crafted S/MIME message with an inner encryption layer could be displayed as having a valid signature in some circumstances, even if the signer had no access to the encrypted message. An attacker could potentially exploit this to spoof the message author. (CVE-2019-11755)

Multiple security issues were discovered in Thunderbird. If a user were tricked in to opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, bypass security restrictions, bypass same-origin restrictions, conduct cross-site scripting (XSS) attacks, or execute arbitrary code. (CVE-2019-11757, CVE-2019-11758, CVE-2019-11759, CVE-2019-11760, CVE-2019-11761, CVE-2019-11762, CVE-2019-11763, CVE-2019-11764)

A heap overflow was discovered in the expat library in Thunderbird. If a user were tricked in to opening a specially crafted message, an attacker could potentially exploit this to cause a denial of service, or execute arbitrary code. (CVE-2019-15903)

Update instructions

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

Ubuntu 19.10
thunderbird - 1:68.2.1+build1-0ubuntu0.19.10.1
Ubuntu 18.04 LTS
thunderbird - 1:68.2.1+build1-0ubuntu0.18.04.1

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References