CVE-2015-2721
MEDIUM severity · CVSS 4.3 · CWE-310
4.3CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexity—
Privileges required—
User interaction—
Confidentiality impactNone
Integrity impact—
Availability impactNone
Exploit probability (EPSS)3%
AV:N/AC:M/Au:N/C:N/I:P/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00025.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00031.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00033.htmlAdvisory
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00034.htmlAdvisory
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00021.html
- http://rhn.redhat.com/errata/RHSA-2015-1185.html
- http://rhn.redhat.com/errata/RHSA-2015-1664.html
- http://www.debian.org/security/2015/dsa-3324Advisory