USN-2672-1

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.

References

Affected packages

Ubuntu:14.04:LTS / nss

Package

Name: nss
Purl: pkg:deb/ubuntu/nss@2:3.19.2-0ubuntu0.14.04.1?arch=source&distro=trusty

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2:3.19.2-0ubuntu0.14.04.1

Affected versions

2:3.*

2:3.15.1-1ubuntu1

2:3.15.2-1

2:3.15.3-1

2:3.15.3.1-1

2:3.15.3.1-1.1

2:3.15.3.1-1.1ubuntu1

2:3.15.4-1ubuntu3

2:3.15.4-1ubuntu4

2:3.15.4-1ubuntu5

2:3.15.4-1ubuntu6

2:3.15.4-1ubuntu7

2:3.15.4-1ubuntu7.1

2:3.17-0ubuntu0.14.04.1

2:3.17.1-0ubuntu0.14.04.1

2:3.17.1-0ubuntu0.14.04.2

2:3.17.4-0ubuntu0.14.04.1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libnss3",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
        },
        {
            "binary_name": "libnss3-1d",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
        },
        {
            "binary_name": "libnss3-dev",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
        },
        {
            "binary_name": "libnss3-nssdb",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
        },
        {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.19.2-0ubuntu0.14.04.1"
        }
    ]
}

Database specific

cves_map

{
    "cves": [
        {
            "id": "CVE-2015-2721",
            "severity": [
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2015-2730",
            "severity": [
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:14.04:LTS"
}