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Ubuntu Security Notice USN-2914-1

Ubuntu Security Notice USN-2914-1
Posted Mar 2, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2914-1 - Yuval Yarom, Daniel Genkin, and Nadia Heninger discovered that OpenSSL was vulnerable to a side-channel attack on modular exponentiation. On certain CPUs, a local attacker could possibly use this issue to recover RSA keys. This flaw is known as CacheBleed. Adam Langley discovered that OpenSSL incorrectly handled memory when parsing DSA private keys. A remote attacker could use this issue to cause OpenSSL to crash, resulting in a denial of service, or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, remote, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2016-0702, CVE-2016-0705, CVE-2016-0797, CVE-2016-0798, CVE-2016-0799
MD5 | a6e8d23d1ba8b7f684856e8693de0261

Ubuntu Security Notice USN-2914-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-2914-1
March 01, 2016

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

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

- Ubuntu 15.10
- 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:

Yuval Yarom, Daniel Genkin, and Nadia Heninger discovered that OpenSSL was
vulnerable to a side-channel attack on modular exponentiation. On certain
CPUs, a local attacker could possibly use this issue to recover RSA keys.
This flaw is known as CacheBleed. (CVE-2016-0702)

Adam Langley discovered that OpenSSL incorrectly handled memory when
parsing DSA private keys. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-0705)

Guido Vranken discovered that OpenSSL incorrectly handled hex digit
calculation in the BN_hex2bn function. A remote attacker could use this
issue to cause OpenSSL to crash, resulting in a denial of service, or
possibly execute arbitrary code. (CVE-2016-0797)

Emilia Käsper discovered that OpenSSL incorrectly handled memory when
performing SRP user database lookups. A remote attacker could possibly use
this issue to cause OpenSSL to consume memory, resulting in a denial of
service. (CVE-2016-0798)

Guido Vranken discovered that OpenSSL incorrectly handled memory when
printing very long strings. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2016-0799)

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-0ubuntu1.4

Ubuntu 14.04 LTS:
libssl1.0.0 1.0.1f-1ubuntu2.18

Ubuntu 12.04 LTS:
libssl1.0.0 1.0.1-4ubuntu5.35

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

References:
http://www.ubuntu.com/usn/usn-2914-1
CVE-2016-0702, CVE-2016-0705, CVE-2016-0797, CVE-2016-0798,
CVE-2016-0799

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.0.2d-0ubuntu1.4
https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.18
https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.35


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