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Mozilla Network Security Services (NSS) fails to properly process malformed SSLv2 server messages

Vulnerability Note VU#377812

Original Release Date: 2007-03-07 | Last Revised: 2007-04-05

Overview

A vulnerability in the way Mozilla Network Security Services (NSS) handles malformed SSLv2 server messages may lead to execution of arbitrary code.

Description

The SSLv2 protocol uses a client master key to generate all subsequent session keys. The client master key is created using a public key recieved from the server during phase one of the SSL handshake. Mozilla NSS library contains a vulnerability in the way malformed SSLv2 server messages related to the public key are handled that may result in a buffer overflow. According to the Mozilla Foundation Security Advisory 2007-06:

SSL clients such as Firefox and Thunderbird can suffer a buffer overflow if a malicious server presents a certificate with a public key that is too small to encrypt the entire "Master Secret". Exploiting this overflow appears to be unreliable but possible if the SSLv2 protocol is enabled.

Note that this vulnerability may affect any application that uses the Mozilla NSS library.

Impact

A remote, unauthenticated attacker may be able to execute arbitrary code with the privileges of the user who is running the vulnerable application or cause a denial of service.

Solution

Apply an update
According to the Mozilla Foundation Security Advisory 2007-06, this vulnerability is addressed in Firefox 2.0.0.2, Firefox 1.5.0.10, SeaMonkey 1.0.8, and NSS 3.11.5.

Disable SSLv2


Disabling support for the SSLv2 protocol appears to prevent exploitation of this vulnerability. Instructions for disabling the SSLv2 protocol support in Firefox and Thunderbird can be found in the Mozilla Foundation Security Advisory 2007-06.

Vendor Information

377812
 
Affected   Unknown   Unaffected

Fedora Project

Updated:  March 07, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to FEDORA-2007-308 and FEDORA-2007-309.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Gentoo Linux

Updated:  April 05, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to glsa-200703-18.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Mandriva, Inc.

Updated:  March 07, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to Mandriva Linux Security Advisory MDKSA-2007:052.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Mozilla

Updated:  February 27, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to Mozilla Foundation Security Advisory 2007-06.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Red Hat, Inc.

Updated:  March 07, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to RHSA-2007-0079.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

SUSE Linux

Updated:  March 07, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to SUSE-SA:2007:019.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Slackware Linux Inc.

Updated:  April 05, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to SSA:2007-066-04.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Sun Microsystems, Inc.

Updated:  April 05, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to Sun Alert Notification 102856.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

Ubuntu

Updated:  March 07, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to Ubuntu Security Notice USN-431-1.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

rPath

Updated:  March 07, 2007

Status

  Vulnerable

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Refer to rPath Security Advisory: 2007-0040-3.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A

References

Acknowledgements

This vulnerability was reported in Mozilla Foundation Security Advisory 2007-06. Mozilla credits iDefense with reporting this issue.

This document was written by Chris Taschner.

Other Information

CVE IDs: CVE-2007-0008
Severity Metric: 12.72
Date Public: 2007-02-23
Date First Published: 2007-03-07
Date Last Updated: 2007-04-05 18:39 UTC
Document Revision: 59

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