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Ubuntu Security Notice USN-2830-1

Ubuntu Security Notice USN-2830-1
Posted Dec 7, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2830-1 - Guy Leaver discovered that OpenSSL incorrectly handled a ServerKeyExchange for an anonymous DH ciphersuite with the value of p set to 0. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. This issue only applied to Ubuntu 15.10. Hanno B=C3=B6ck discovered that the OpenSSL Montgomery squaring procedure algorithm may produce incorrect results when being used on x86_64. A remote attacker could possibly use this issue to break encryption. This issue only applied to Ubuntu 15.10. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2015-1794, CVE-2015-3193, CVE-2015-3194, CVE-2015-3195, CVE-2015-3196
MD5 | 85b8339f9f77f74db27478628ff3b691

Ubuntu Security Notice USN-2830-1

Change Mirror Download
============================================================================
Ubuntu Security Notice USN-2830-1
December 07, 2015

openssl vulnerabilities
============================================================================

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

- Ubuntu 15.10
- Ubuntu 15.04
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

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

Details:

Guy Leaver discovered that OpenSSL incorrectly handled a ServerKeyExchange
for an anonymous DH ciphersuite with the value of p set to 0. A remote
attacker could possibly use this issue to cause OpenSSL to crash, resulting
in a denial of service. This issue only applied to Ubuntu 15.10.
(CVE-2015-1794)

Hanno B=C3=B6ck discovered that the OpenSSL Montgomery squaring procedure
algorithm may produce incorrect results when being used on x86_64. A remote
attacker could possibly use this issue to break encryption. This issue only
applied to Ubuntu 15.10. (CVE-2015-3193)

Lo=C3=AFc Jonas Etienne discovered that OpenSSL incorrectly handled ASN.1
signatures with a missing PSS parameter. A remote attacker could possibly
use this issue to cause OpenSSL to crash, resulting in a denial of service.
(CVE-2015-3194)

Adam Langley discovered that OpenSSL incorrectly handled malformed
X509_ATTRIBUTE structures. A remote attacker could possibly use this issue
to cause OpenSSL to consume resources, resulting in a denial of service.
(CVE-2015-3195)

It was discovered that OpenSSL incorrectly handled PSK identity hints. A
remote attacker could possibly use this issue to cause OpenSSL to crash,
resulting in a denial of service. This issue only applied to Ubuntu 12.04
LTS, Ubuntu 14.04 LTS and Ubuntu 15.04. (CVE-2015-3196)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 15.10:
libssl1.0.0 1.0.2d-0ubuntu1.2

Ubuntu 15.04:
libssl1.0.0 1.0.1f-1ubuntu11.5

Ubuntu 14.04 LTS:
libssl1.0.0 1.0.1f-1ubuntu2.16

Ubuntu 12.04 LTS:
libssl1.0.0 1.0.1-4ubuntu5.32

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

References:
http://www.ubuntu.com/usn/usn-2830-1
CVE-2015-1794, CVE-2015-3193, CVE-2015-3194, CVE-2015-3195,
CVE-2015-3196

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.0.2d-0ubuntu1.2
https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu11.5
https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.16
https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.32

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