USN-1732-3: OpenSSL vulnerability

Releases

• Ubuntu 12.10
• Ubuntu 12.04

Packages

• openssl - Secure Socket Layer (SSL) cryptographic library and tools

Details

USN-1732-1 fixed vulnerabilities in OpenSSL. The fix for CVE-2013-0169 and
CVE-2012-2686 was reverted in USN-1732-2 because of a regression. This
update restores the security fix, and includes an extra fix from upstream
to address the AES-NI regression. We apologize for the inconvenience.

Original advisory details:

Adam Langley and Wolfgang Ettlingers discovered that OpenSSL incorrectly
handled certain crafted CBC data when used with AES-NI. A remote attacker
could use this issue to cause OpenSSL to crash, resulting in a denial of
service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 12.10.
(CVE-2012-2686)

Nadhem Alfardan and Kenny Paterson discovered that the TLS protocol as used
in OpenSSL was vulnerable to a timing side-channel attack known as the
"Lucky Thirteen" issue. A remote attacker could use this issue to perform
plaintext-recovery attacks via analysis of timing data. (CVE-2013-0169)

Update instructions

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

Ubuntu 12.10

• libssl1.0.0 - 1.0.1c-3ubuntu2.3

Ubuntu 12.04

• libssl1.0.0 - 1.0.1-4ubuntu5.8

After a standard system update you need to reboot your computer to make
all the necessary changes.

References

• CVE-2013-0169

Related notices

• USN-1732-1: libssl0.9.8, openssl, libssl1.0.0
• USN-1735-1: openjdk-7-jre, openjdk-7-jre-zero, icedtea-6-jre-jamvm, openjdk-7-jre-lib, icedtea-6-jre-cacao, openjdk-7, openjdk-6-jre-headless, icedtea-7-jre-cacao, openjdk-6-jre-lib, openjdk-7-jre-headless, openjdk-6-jre, openjdk-6-jre-zero, openjdk-6, icedtea-7-jre-jamvm