Ubuntu 12.10 USN-1732-1 Critical: OpenSSL Denial Of Service Threats Fixed

ubuntu

February 21, 2013

Several security issues were fixed in OpenSSL.

Summary

Several security issues were fixed in OpenSSL.

Software Description:

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

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)

Stephen Henson discovered that OpenSSL incorrectly performed signature

verification for OCSP responses. A remote attacker could use this issue to

cause OpenSSL to crash, resulting in a denial of service. (CVE-2013-0166)

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)

Topics Covered

security advisory denial of service critical issue Ubuntu OpenSSL

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-3ubuntu2.1

Ubuntu 12.04 LTS:
  libssl1.0.0                     1.0.1-4ubuntu5.6

Ubuntu 11.10:
  libssl1.0.0                     1.0.0e-2ubuntu4.7

Ubuntu 10.04 LTS:
  libssl0.9.8                     0.9.8k-7ubuntu8.14

Ubuntu 8.04 LTS:
  libssl0.9.8                     0.9.8g-4ubuntu3.20

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