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[USN-1732-2] OpenSSL regression

Posted on 28 February 2013
Ubuntu Security

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Ubuntu Security Notice USN-1732-2
February 28, 2013

openssl regression
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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 an=
d
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 attacke=
r
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 perfor=
m
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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