USN-3181-1: OpenSSL vulnerabilities

Releases

• Ubuntu 16.10
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM
• Ubuntu 12.04

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)

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

• libssl1.0.0 - 1.0.2g-1ubuntu4.6

Ubuntu 14.04

• libssl1.0.0 - 1.0.1f-1ubuntu2.22

Ubuntu 12.04

• 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

• CVE-2016-2177
• CVE-2016-7055
• CVE-2016-7056
• CVE-2016-8610
• CVE-2017-3731
• CVE-2017-3732

Related notices

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