[USN-3927-1] Thunderbird vulnerabilities

Chris Coulson chris.coulson at canonical.com
Thu Mar 28 21:44:53 UTC 2019

Ubuntu Security Notice USN-3927-1
March 28, 2019

thunderbird vulnerabilities

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS


Several security issues were fixed in Thunderbird.

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


It was discovered that Thunderbird allowed PAC files to specify that
requests to localhost are sent through the proxy to another server. If
proxy auto-detection is enabled, an attacker could potentially exploit
this to conduct attacks on local services and tools. (CVE-2018-18506)

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,
or execute arbitrary code. (CVE-2019-9788, CVE-2019-9790, CVE-2019-9791,
CVE-2019-9792, CVE-2019-9795, CVE-2019-9796, CVE-2019-9810, CVE-2019-9813)

A mechanism was discovered that removes some bounds checking for string,
array, or typed array accesses if Spectre mitigations have been disabled.
If a user were tricked in to opening a specially crafted website in a
browsing context with Spectre mitigations disabled, an attacker could
potentially exploit this to cause a denial of service, or execute
arbitrary code. (CVE-2019-9793)

Update instructions:

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

Ubuntu 18.10:
  thunderbird                     1:60.6.1+build2-0ubuntu0.18.10.1

Ubuntu 18.04 LTS:
  thunderbird                     1:60.6.1+build2-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
  thunderbird                     1:60.6.1+build2-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
  thunderbird                     1:60.6.1+build2-0ubuntu0.14.04.1

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

  CVE-2018-18506, CVE-2019-9788, CVE-2019-9790, CVE-2019-9791,
  CVE-2019-9792, CVE-2019-9793, CVE-2019-9795, CVE-2019-9796,
  CVE-2019-9810, CVE-2019-9813

Package Information:

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