Advisory Published

USN-2673-1: Thunderbird vulnerabilities

First published: Mon Jul 20 2015(Updated: )

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property. (CVE-2015-2721) Bob Clary, Christian Holler, Bobby Holley, and Andrew McCreight discovered multiple memory safety issues 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 via application crash, or execute arbitrary code with the privileges of the user invoking Thunderbird. (CVE-2015-2724) Ronald Crane discovered multiple security vulnerabilities. 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 via application crash, or execute arbitrary code with the privileges of the user invoking Thunderbird. (CVE-2015-2734, CVE-2015-2735, CVE-2015-2736, CVE-2015-2737, CVE-2015-2738, CVE-2015-2739, CVE-2015-2740) Matthew Green discovered a DHE key processing issue in NSS where a MITM could force a server to downgrade TLS connections to 512-bit export-grade cryptography. An attacker could potentially exploit this to impersonate the server. (CVE-2015-4000)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/thunderbird<1:31.8.0+build1-0ubuntu0.15.04.1
1:31.8.0+build1-0ubuntu0.15.04.1
=15.04
All of
ubuntu/thunderbird<1:31.8.0+build1-0ubuntu0.14.10.1
1:31.8.0+build1-0ubuntu0.14.10.1
=14.10
All of
ubuntu/thunderbird<1:31.8.0+build1-0ubuntu0.14.04.1
1:31.8.0+build1-0ubuntu0.14.04.1
=14.04
All of
ubuntu/thunderbird<1:31.8.0+build1-0ubuntu0.12.04.1
1:31.8.0+build1-0ubuntu0.12.04.1
=12.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this Thunderbird vulnerability?

    The vulnerability ID for this Thunderbird vulnerability is CVE-2015-...

  • What is the description of this Thunderbird vulnerability?

    This Thunderbird vulnerability allows a remote attacker to perform a machine-in-the-middle attack and remove the forward-secrecy property.

  • Which version of Thunderbird is affected by this vulnerability?

    Versions 1:31.8.0+build1-0ubuntu0.15.04.1, 1:31.8.0+build1-0ubuntu0.14.10.1, 1:31.8.0+build1-0ubuntu0.14.04.1, and 1:31.8.0+build1-0ubuntu0.12.04.1 of Thunderbird are affected by this vulnerability.

  • What is the severity of this Thunderbird vulnerability?

    The severity of this Thunderbird vulnerability is not specified.

  • How can I fix this Thunderbird vulnerability?

    To fix this Thunderbird vulnerability, update to version 1:31.8.0+build1-0ubuntu0.15.04.1, 1:31.8.0+build1-0ubuntu0.14.10.1, 1:31.8.0+build1-0ubuntu0.14.04.1, or 1:31.8.0+build1-0ubuntu0.12.04.1 of Thunderbird.

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