Ubuntu: 1732-2: OpenSSL regression
Posted by Benjamin D. Thomas   
Ubuntu USN-1732-1 introduced a regression in OpenSSL.
Ubuntu Security Notice USN-1732-2
February 28, 2013

openssl regression

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS


USN-1732-1 introduced a regression in OpenSSL.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools


USN-1732-1 fixed vulnerabilities in OpenSSL. The fix for CVE-2013-0166 and
CVE-2012-2686 introduced a regression causing decryption failures on
hardware supporting AES-NI. This update temporarily reverts the security
fix pending further investigation. 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.
  Nadhem Alfardan and Kenny Paterson discovered that the TLS protocol as
 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-3ubuntu2.2
  openssl                         1.0.1c-3ubuntu2.2

Ubuntu 12.04 LTS:
  libssl1.0.0                     1.0.1-4ubuntu5.7
  openssl                         1.0.1-4ubuntu5.7

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


Package Information: