Ubuntu Security Notice USN-2639-1
11th June, 2015
openssl vulnerabilities
A security issue affects these releases of Ubuntu and its
derivatives:
- Ubuntu 15.04
- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
Summary
Several security issues were fixed in OpenSSL.
Software description
- 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 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
The problem can be corrected by updating your system to the following
package version:
- Ubuntu 15.04:
-
libssl1.0.0
1.0.1f-1ubuntu11.4
- Ubuntu 14.10:
-
libssl1.0.0
1.0.1f-1ubuntu9.8
- Ubuntu 14.04 LTS:
-
libssl1.0.0
1.0.1f-1ubuntu2.15
- Ubuntu 12.04 LTS:
-
libssl1.0.0
1.0.1-4ubuntu5.31
To update your system, please follow these instructions:
https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make
all the necessary changes.