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Ubuntu Security Notice USN-3475-1

Ubuntu Security Notice USN-3475-1
Posted Nov 6, 2017
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3475-1 - It was discovered that OpenSSL incorrectly parsed the IPAddressFamily extension in X.509 certificates, resulting in an erroneous display of the certificate in text format. 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, Ubuntu 16.10 and Ubuntu 17.04. Various other issues were also addressed.

tags | advisory, remote
systems | linux, ubuntu
advisories | CVE-2017-3735, CVE-2017-3736
SHA-256 | dc6c25451009be5ce9782f82197c75fdc4e6f83d2f796ae27a71f4e114494fe0

Ubuntu Security Notice USN-3475-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3475-1
November 06, 2017

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

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

- Ubuntu 17.10
- Ubuntu 17.04
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in OpenSSL.

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

Details:

It was discovered that OpenSSL incorrectly parsed the IPAddressFamily
extension in X.509 certificates, resulting in an erroneous display of the
certificate in text format. (CVE-2017-3735)

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, Ubuntu 16.10 and Ubuntu 17.04. (CVE-2017-3736)

Update instructions:

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

Ubuntu 17.10:
libssl1.0.0 1.0.2g-1ubuntu13.2

Ubuntu 17.04:
libssl1.0.0 1.0.2g-1ubuntu11.3

Ubuntu 16.04 LTS:
libssl1.0.0 1.0.2g-1ubuntu4.9

Ubuntu 14.04 LTS:
libssl1.0.0 1.0.1f-1ubuntu2.23

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

References:
https://www.ubuntu.com/usn/usn-3475-1
CVE-2017-3735, CVE-2017-3736

Package Information:
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu13.2
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu11.3
https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.9
https://launchpad.net/ubuntu/+source/openssl/1.0.1f-1ubuntu2.23


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