USN-3372-1: NSS vulnerability

Releases

• Ubuntu 12.04

Packages

• nss - Network Security Service library

Details

It was discovered that NSS incorrectly handled certain empty SSLv2
messages. A remote attacker could possibly use this issue to cause NSS to
crash, resulting in a denial of service. (CVE-2017-7502)

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 causes NSS to limit use of the same symmetric key.
(CVE-2016-2183)

It was discovered that NSS incorrectly handled Base64 decoding. A remote
attacker could use this flaw to cause NSS to crash, resulting in a denial
of service, or possibly execute arbitrary code. (CVE-2017-5461)

Update instructions

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

Ubuntu 12.04

• libnss3 - 2:3.28.4-0ubuntu0.12.04.1

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart any applications
that use NSS, such as Evolution and Chromium, to make all the necessary
changes.

References

• CVE-2017-7502
• CVE-2016-2183
• CVE-2017-5461

Related notices

• USN-3336-1
• USN-3198-1
• USN-3179-1
• USN-3270-1
• USN-3087-1
• USN-3194-1
• USN-3278-1
• USN-3260-1