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Ubuntu Security Notice USN-1732-2

Ubuntu Security Notice USN-1732-2
Posted Feb 28, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1732-2 - 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. 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 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. Various other issues were also addressed.

tags | advisory, remote, denial of service, vulnerability, protocol
systems | linux, ubuntu
advisories | CVE-2012-2686, CVE-2013-0169
MD5 | 67e010cfecf21a6e2196f106c8536117

Ubuntu Security Notice USN-1732-2

Change Mirror Download
============================================================================
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

Summary:

USN-1732-1 introduced a regression in OpenSSL.

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

Details:

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.
(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-3ubuntu2.2
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.

References:
http://www.ubuntu.com/usn/usn-1732-2
http://www.ubuntu.com/usn/usn-1732-1
https://launchpad.net/bugs/1133333

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.0.1c-3ubuntu2.2
https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.7
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