Mozilla Network Security Services information disclosure

mozilla-nss-cve20131740-info-disc (90394) The risk level is classified as MediumMedium Risk


Mozilla Network Security Services could allow a remote attacker to obtain sensitive information, caused by an error in the ssl_Do1stHandshake() function. An attacker could exploit this vulnerability to return unencrypted, unauthenticated data from PR_Recv.


Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
Temporal Score: 3.7
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Obtain Information


Upgrade to the latest version of Network Security Services (3.15.4 or later), available from the Mozilla Web site. See References.

For other distributions:
Apply the appropriate update for your system. See References.


  • Mozilla Web site: NSS 3.15.4 release notes.
  • Pale Moon Web site: Release notes 24.3.0 (2014-01-28).
  • BID-64944: Network Security Services 'ssl_Do1stHandshake()' Function Information Disclosure Vulnerability
  • CVE-2013-1740: The ssl_Do1stHandshake function in sslsecur.c in libssl in Mozilla Network Security Services (NSS) before 3.15.4, when the TLS False Start feature is enabled, allows man-in-the-middle attackers to spoof SSL servers by using an arbitrary X.509 certificate during certain handshake traffic.
  • RHSA-2014-0917: Critical: nss and nspr security, bug fix, and enhancement update
  • RHSA-2014-1246: Moderate: nss and nspr security, bug fix, and enhancement update
  • SA56386: Network Security Services (NSS) False Start PR_Recv Information Disclosure Security Issue
  • SA56608: Pale Moon Information Disclosure Security Issue and Unspecified Vulnerabilities

Platforms Affected:

  • Mozilla Network Security Services 3.14.1
  • Pale Moon Pale Moon 24
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6


Jan 09, 2014

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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