Advisory Published

USN-2672-1: NSS vulnerabilities

First published: Thu Jul 09 2015(Updated: )

Karthikeyan Bhargavan discovered that NSS incorrectly handled state transitions for the TLS state machine. If a remote attacker were able to perform a machine-in-the-middle attack, this flaw could be exploited to skip the ServerKeyExchange message and remove the forward-secrecy property. (CVE-2015-2721) Watson Ladd discovered that NSS incorrectly handled Elliptical Curve Cryptography (ECC) multiplication. A remote attacker could possibly use this issue to spoof ECDSA signatures. (CVE-2015-2730) As a security improvement, this update modifies NSS behaviour to reject DH key sizes below 768 bits, preventing a possible downgrade attack. This update also refreshes the NSS package to version 3.19.2 which includes the latest CA certificate bundle.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libnss3<2:3.19.2-0ubuntu15.04.1
2:3.19.2-0ubuntu15.04.1
=15.04
All of
ubuntu/libnss3<2:3.19.2-0ubuntu0.14.10.1
2:3.19.2-0ubuntu0.14.10.1
=14.10
All of
ubuntu/libnss3<2:3.19.2-0ubuntu0.14.04.1
2:3.19.2-0ubuntu0.14.04.1
=14.04
All of
ubuntu/libnss3<3.19.2-0ubuntu0.12.04.1
3.19.2-0ubuntu0.12.04.1
=12.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID?

    The vulnerability ID is USN-2672-1.

  • What was discovered about NSS?

    NSS incorrectly handled state transitions for the TLS state machine.

  • What is the impact of this vulnerability?

    An attacker could exploit this vulnerability to perform a man-in-the-middle attack and remove the forward-secrecy property.

  • How can this vulnerability be exploited?

    By performing a machine-in-the-middle attack, an attacker can exploit this vulnerability.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability at the following references: [CVE-2015-2721](https://ubuntu.com/security/CVE-2015-2721), [CVE-2015-2730](https://ubuntu.com/security/CVE-2015-2730), [USN-2673-1](https://ubuntu.com/security/notices/USN-2673-1)

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