1. Ubuntu Security Notices
  2. USN-2639-1

USN-2639-1: OpenSSL vulnerabilities

Publication date

11 June 2015

Overview

Several security issues were fixed in OpenSSL.

Releases

Packages

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

Details

Praveen Kariyanahalli, Ivan Fratric and Felix Groebert discovered that
OpenSSL incorrectly handled memory when buffering DTLS data. A remote
attacker could use this issue to cause OpenSSL to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2014-8176)

Joseph Barr-Pixton discovered that OpenSSL incorrectly handled malformed
ECParameters structures. A remote attacker could use this issue to cause
OpenSSL to hang, resulting in a denial of service. (CVE-2015-1788)

Robert Swiecki and Hanno Böck discovered that OpenSSL incorrectly handled
certain ASN1_TIME strings. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service. (CVE-2015-1789)

Michal Zalewski discovered that OpenSSL incorrectly handled missing content
when parsing ASN.1-encoded PKCS#7...

Praveen Kariyanahalli, Ivan Fratric and Felix Groebert discovered that
OpenSSL incorrectly handled memory when buffering DTLS data. A remote
attacker could use this issue to cause OpenSSL to crash, resulting in a
denial of service, or possibly execute arbitrary code. (CVE-2014-8176)

Joseph Barr-Pixton discovered that OpenSSL incorrectly handled malformed
ECParameters structures. A remote attacker could use this issue to cause
OpenSSL to hang, resulting in a denial of service. (CVE-2015-1788)

Robert Swiecki and Hanno Böck discovered that OpenSSL incorrectly handled
certain ASN1_TIME strings. A remote attacker could use this issue to cause
OpenSSL to crash, resulting in a denial of service. (CVE-2015-1789)

Michal Zalewski discovered that OpenSSL incorrectly handled missing content
when parsing ASN.1-encoded PKCS#7 blobs. A remote attacker could use this
issue to cause OpenSSL to crash, resulting in a denial of service.
(CVE-2015-1790)

Emilia Käsper discovered that OpenSSL incorrectly handled NewSessionTicket
when being used by a multi-threaded client. A remote attacker could use
this issue to cause OpenSSL to crash, resulting in a denial of service.
(CVE-2015-1791)

Johannes Bauer discovered that OpenSSL incorrectly handled verifying
signedData messages using the CMS code. A remote attacker could use this
issue to cause OpenSSL to hang, resulting in a denial of service.
(CVE-2015-1792)

As a security improvement, this update also modifies OpenSSL behaviour to
reject DH key sizes below 768 bits, preventing a possible downgrade
attack.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
15.04 vivid libssl1.0.0 –  1.0.1f-1ubuntu11.4
14.10 utopic libssl1.0.0 –  1.0.1f-1ubuntu9.8
14.04 trusty libssl1.0.0 –  1.0.1f-1ubuntu2.15
12.04 precise libssl1.0.0 –  1.0.1-4ubuntu5.31

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References

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