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USN-3181-1: OpenSSL vulnerabilities

31 January 2017

Several security issues were fixed in OpenSSL.

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Releases

Packages

  • 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 Święcki 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)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 16.10
Ubuntu 16.04
Ubuntu 14.04
Ubuntu 12.04

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

Related notices

  • USN-3087-1: libssl1.0.0, libssl1.0.0-udeb, libssl-dev, libssl-doc, openssl, libcrypto1.0.0-udeb
  • USN-3183-1: gnutls-bin, guile-gnutls, libgnutls-dev, libgnutls28-dev, libgnutls30, gnutls-doc, gnutls26, gnutls28, libgnutlsxx27, libgnutls-openssl27, libgnutls26, gnutls26-doc, libgnutlsxx28
  • USN-3183-2: gnutls-bin, libgnutls-dev, gnutls26, libgnutlsxx27, libgnutls-openssl27, libgnutls26, gnutls26-doc