USN-3087-1: OpenSSL vulnerabilities

Releases

• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM
• Ubuntu 12.04

Packages

• openssl - Secure Socket Layer (SSL) cryptographic library and tools

Details

Shi Lei discovered that OpenSSL incorrectly handled the OCSP Status Request
extension. A remote attacker could possibly use this issue to cause memory
consumption, resulting in a denial of service. (CVE-2016-6304)

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 has only been addressed in Ubuntu 16.04 LTS in this update.
(CVE-2016-2177)

César Pereida, Billy Brumley, and Yuval Yarom discovered that OpenSSL
did not properly use constant-time operations when performing DSA signing.
A remote attacker could possibly use this issue to perform a cache-timing
attack and recover private DSA keys. (CVE-2016-2178)

Quan Luo discovered that OpenSSL did not properly restrict the lifetime
of queue entries in the DTLS implementation. A remote attacker could
possibly use this issue to consume memory, resulting in a denial of
service. (CVE-2016-2179)

Shi Lei discovered that OpenSSL incorrectly handled memory in the
TS_OBJ_print_bio() function. A remote attacker could possibly use this
issue to cause a denial of service. (CVE-2016-2180)

It was discovered that the OpenSSL incorrectly handled the DTLS anti-replay
feature. A remote attacker could possibly use this issue to cause a denial
of service. (CVE-2016-2181)

Shi Lei discovered that OpenSSL incorrectly validated division results. A
remote attacker could possibly use this issue to cause a denial of service.
(CVE-2016-2182)

Karthik Bhargavan and Gaetan Leurent discovered that the DES and Triple DES
ciphers were vulnerable to birthday attacks. A remote attacker could
possibly use this flaw to obtain clear text data from long encrypted
sessions. This update moves DES from the HIGH cipher list to MEDIUM.
(CVE-2016-2183)

Shi Lei discovered that OpenSSL incorrectly handled certain ticket lengths.
A remote attacker could use this issue to cause a denial of service.
(CVE-2016-6302)

Shi Lei discovered that OpenSSL incorrectly handled memory in the
MDC2_Update() function. A remote attacker could possibly use this issue to
cause a denial of service. (CVE-2016-6303)

Shi Lei discovered that OpenSSL incorrectly performed certain message
length checks. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2016-6306)

Update instructions

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

Ubuntu 16.04

• libssl1.0.0 - 1.0.2g-1ubuntu4.4

Ubuntu 14.04

• libssl1.0.0 - 1.0.1f-1ubuntu2.20

Ubuntu 12.04

• libssl1.0.0 - 1.0.1-4ubuntu5.37

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

References

• CVE-2016-2177
• CVE-2016-2178
• CVE-2016-2179
• CVE-2016-2180
• CVE-2016-2181
• CVE-2016-2182
• CVE-2016-2183
• CVE-2016-6302
• CVE-2016-6303
• CVE-2016-6304
• CVE-2016-6306

Related notices

• USN-3181-1: libssl-doc, libssl1.0.0, libcrypto1.0.0-udeb, libssl1.0.0-udeb, libssl-dev, openssl
• USN-3372-1: nss, libnss3
• USN-3198-1: icedtea-6-jre-jamvm, icedtea-6-jre-cacao, openjdk-6-jdk, openjdk-6-jre-headless, openjdk-6-jre-lib, openjdk-6-jre, openjdk-6-jre-zero, openjdk-6
• USN-3179-1: openjdk-8-jre, openjdk-8-jre-jamvm, openjdk-8-source, openjdk-8-jdk-headless, openjdk-8-demo, openjdk-8-jdk, openjdk-8, openjdk-8-doc, openjdk-8-jre-zero, openjdk-8-jre-headless
• USN-3270-1: libnss3-1d, libnss3-nssdb, nss, libnss3-dev, libnss3-tools, libnss3
• USN-3194-1: openjdk-7-jre, openjdk-7-jre-zero, openjdk-7-source, openjdk-7-jre-lib, openjdk-7, openjdk-7-demo, openjdk-7-jre-headless, openjdk-7-doc, openjdk-7-jdk, icedtea-7-jre-jamvm