CVE-2015-2721: canonical ubuntu_linux Cryptographic Issues

Vulnerability summary

CVE-2015-2721 is a medium (CVSS 4.3) Cryptographic Issues vulnerability in canonical ubuntu_linux. EPSS estimates a 2.83% chance of exploitation in the next 30 days, higher than 86.6% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 06-07-2015
   PublishedVulnerability first disclosed.
2. 06-08-2024
   Last modifiedVulnerability information updated.

Description

Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.

• CWE-310Cryptographic IssuesWeaknesses in this category are related to the design and implementation of data confidentiality and integrity. Frequently these deal with the use of encoding techniques, encryption libraries, and hashing algorithms. The weaknesses in this category could lead to a degradation of the quality data if they are not addressed.