USN-2673-1: Thunderbird vulnerabilities

Details

Karthikeyan Bhargavan discovered that NSS incorrectly handled state
transitions for the TLS state machine. If a remote attacker were able to
perform a man-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)

Update instructions

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

Ubuntu 15.04

• thunderbird - 1:31.8.0+build1-0ubuntu0.15.04.1

Ubuntu 14.10

• thunderbird - 1:31.8.0+build1-0ubuntu0.14.10.1

Ubuntu 14.04

• thunderbird - 1:31.8.0+build1-0ubuntu0.14.04.1

Ubuntu 12.04

• thunderbird - 1:31.8.0+build1-0ubuntu0.12.04.1

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

References

• CVE-2015-2721
• CVE-2015-2724
• CVE-2015-2734
• CVE-2015-2735
• CVE-2015-2736
• CVE-2015-2737
• CVE-2015-2738
• CVE-2015-2739
• CVE-2015-2740
• CVE-2015-4000

Related notices

• 2696-1: icedtea-7-jre-jamvm, openjdk-7-jre, openjdk-7-jre-zero, openjdk-7-jre-headless, openjdk-7-jdk, openjdk-7-jre-lib, openjdk-7
• USN-2656-1: firefox
• USN-2656-2: firefox
• USN-2672-1: libnss3, nss
• USN-2696-1: icedtea-7-jre-jamvm, openjdk-7-jre, openjdk-7-jre-zero, openjdk-7-jre-headless, openjdk-7-jdk, openjdk-7-jre-lib, openjdk-7
• USN-2706-1: openjdk-6-jre, icedtea-6-jre-jamvm, openjdk-6, openjdk-6-jre-headless, openjdk-6-jre-lib, openjdk-6-jre-zero, openjdk-6-source, icedtea-6-jre-cacao, openjdk-6-jdk