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Ubuntu Security Notice USN-1732-1
February 21, 2013

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

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)

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.

References:
  http://www.ubuntu.com/usn/usn-1732-1
  CVE-2012-2686, CVE-2013-0166, CVE-2013-0169

Package Information:
  https://launchpad.net/ubuntu/+source/openssl/1.0.1c-3ubuntu2.1
  https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.6
  https://launchpad.net/ubuntu/+source/openssl/1.0.0e-2ubuntu4.7
  https://launchpad.net/ubuntu/+source/openssl/0.9.8k-7ubuntu8.14
  https://launchpad.net/ubuntu/+source/openssl/0.9.8g-4ubuntu3.20