Ubuntu Security Notice 1732-3 - 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. 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.
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Ubuntu Security Notice USN-1732-3
March 25, 2013
openssl vulnerability
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A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.10
- Ubuntu 12.04 LTS
Summary:
Several security issues were fixed 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-2013-0169 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 LTS:
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:
http://www.ubuntu.com/usn/usn-1732-3
http://www.ubuntu.com/usn/usn-1732-1
CVE-2013-0169
Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.0.1c-3ubuntu2.3
https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.8