nss and nspr (SL5)

Synopsis: Moderate: nss and nspr security, bug fix, and enhancement update
Advisory ID: SLSA-2014:1246-1
Issue Date: 2014-09-16
CVE Numbers: CVE-2013-1740

A flaw was found in the way TLS False Start was implemented in NSS. An
attacker could use this flaw to potentially return unencrypted information
from the server. (CVE-2013-1740)

A race condition was found in the way NSS implemented session ticket
handling as specified by RFC 5077. An attacker could use this flaw to
crash an application using NSS or, in rare cases, execute arbitrary code
with the privileges of the user running that application. (CVE-2014-1490)

It was found that NSS accepted weak Diffie-Hellman Key exchange (DHKE)
parameters. This could possibly lead to weak encryption being used in
communication between the client and the server. (CVE-2014-1491)

An out-of-bounds write flaw was found in NSPR. A remote attacker could
potentially use this flaw to crash an application using NSPR or, possibly,
execute arbitrary code with the privileges of the user running that
application. This NSPR flaw was not exposed to web content in any shipped
version of Firefox. (CVE-2014-1545)

It was found that the implementation of Internationalizing Domain Names in
Applications (IDNA) hostname matching in NSS did not follow the RFC 6125
recommendations. This could lead to certain invalid certificates with
international characters to be accepted as valid. (CVE-2014-1492)

The nss and nspr packages have been upgraded to upstream version 3.16.1
and 4.10.6 respectively, which provide a number of bug fixes and
enhancements over the previous versions.

This update also fixes the following bugs:

* Previously, when the output.log file was not present on the system, the
shell in the Network Security Services (NSS) specification handled test
failures incorrectly as false positive test results. Consequently, certain
utilities, such as “grep”, could not handle failures properly. This update
improves error detection in the specification file, and “grep” and other
utilities now handle missing files or crashes as intended.

* Prior to this update, a subordinate Certificate Authority (CA) of the
ANSSI agency incorrectly issued an intermediate certificate installed on a
network monitoring device. As a consequence, the monitoring device was
enabled to act as an MITM (Man in the Middle) proxy performing traffic
management of domain names or IP addresses that the certificate holder did
not own or control. The trust in the intermediate certificate to issue the
certificate for an MITM device has been revoked, and such a device can no
longer be used for MITM attacks.

* Due to a regression, MD5 certificates were rejected by default because
Network Security Services (NSS) did not trust MD5 certificates. With this
update, MD5 certificates are supported in Scientific Linux 5.


– Scientific Linux Development Team