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Ubuntu Security Notice USN-3181-1

Ubuntu Security Notice USN-3181-1
Posted Feb 1, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3181-1 - Guido Vranken discovered that OpenSSL used undefined behaviour when performing pointer arithmetic. 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 and Ubuntu 14.04 LTS as other releases were fixed in a previous security update. It was discovered that OpenSSL did not properly handle Montgomery multiplication, resulting in incorrect results leading to transient failures. This issue only applied to Ubuntu 16.04 LTS, and Ubuntu 16.10. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2016-2177, CVE-2016-7055, CVE-2016-7056, CVE-2016-8610, CVE-2017-3731, CVE-2017-3732
SHA-256 | 57bc2db6d746d9332099eb6b7e11a55d8ecf7dce6e56d672f080cb8e2faff1ab

Ubuntu Security Notice USN-3181-1

Change Mirror Download

===========================================================================
Ubuntu Security Notice USN-3181-1
January 31, 2017

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

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

- Ubuntu 16.10
- Ubuntu 16.04 LTS
- 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:

Guido Vranken discovered that OpenSSL used undefined behaviour when
performing pointer arithmetic. 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 and Ubuntu 14.04 LTS as other
releases were fixed in a previous security update. (CVE-2016-2177)

It was discovered that OpenSSL did not properly handle Montgomery
multiplication, resulting in incorrect results leading to transient
failures. This issue only applied to Ubuntu 16.04 LTS, and Ubuntu 16.10.
(CVE-2016-7055)

It was discovered that OpenSSL did not properly use constant-time
operations when performing ECDSA P-256 signing. A remote attacker could
possibly use this issue to perform a timing attack and recover private
ECDSA keys. This issue only applied to Ubuntu 12.04 LTS and Ubuntu 14.04
LTS. (CVE-2016-7056)

Shi Lei discovered that OpenSSL incorrectly handled certain warning alerts.
A remote attacker could possibly use this issue to cause OpenSSL to stop
responding, resulting in a denial of service. (CVE-2016-8610)

Robert =C5=9Awi=C4=99cki discovered that OpenSSL incorrectly handled certain
truncated packets. A remote attacker could possibly use this issue to cause
OpenSSL to crash, resulting in a denial of service. (CVE-2017-3731)

It was discovered that OpenSSL incorrectly performed the x86_64 Montgomery
squaring procedure. While unlikely, a remote attacker could possibly use
this issue to recover private keys. This issue only applied to Ubuntu 16.04
LTS, and Ubuntu 16.10. (CVE-2017-3732)

Update instructions:

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

Ubuntu 16.10:
libssl1.0.0 1.0.2g-1ubuntu9.1

Ubuntu 16.04 LTS:
libssl1.0.0 1.0.2g-1ubuntu4.6

Ubuntu 14.04 LTS:
libssl1.0.0 1.0.1f-1ubuntu2.22

Ubuntu 12.04 LTS:
libssl1.0.0 1.0.1-4ubuntu5.39

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

References:
http://www.ubuntu.com/usn/usn-3181-1
CVE-2016-2177, CVE-2016-7055, CVE-2016-7056, CVE-2016-8610,
CVE-2017-3731, CVE-2017-3732

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu9.1
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.6
https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.22
https://launchpad.net/ubuntu/+source/openssl/1.0.1-4ubuntu5.39



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