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Vulnerability Alert

Nginx Web Server Stack-Based Buffer Overflow Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:29247
Version:1
First Published:2013 May 09 19:28 GMT
Last Published:2013 May 09 19:28 GMT
Port: Not available
CVE:CVE-2013-2028
BugTraq ID:59699
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:7.7
Related Resources:
View related IPS Signature
 
 
Version Summary:Nginx Web Server contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code. Updates are available.
 
 
Description
A vulnerability in Nginx Web Server could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability is due to improper handling of crafted HTTP requests by a worker process used by the affected software. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted request to a targeted system. When processed, the request could allow the attacker to execute arbitrary code in the security context of the affected application.

Nginx.org has confirmed this vulnerability and released updated software.
 
Warning Indicators
Nginx Web Server versions 1.4.0 and prior are vulnerable.
 
IntelliShield Analysis
To exploit the vulnerability, the attacker may need to transmit crafted HTTP requests to the targeted system, which may require access to trusted, internal networks. This access restriction could limit the likelihood of a successful exploit.

Nginx Web Server customers may also consider upgrading to software versions 1.4.1 or 1.5.0 because these versions are not affected by this vulnerability.
 
Vendor Announcements
Nginx.org has released a security advisory at the following link: CVE-2013-2028

FreeBSD has released a VuXML document at the following link: nginx -- Stack-based buffer overflow
 
Impact
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code on a targeted system in the security context of the affected application. Successful exploitation may result in a complete system compromise.
 
Technical Information
The vulnerability is due to improper handling of crafted HTTP requests by a worker process used by the affected software. As a result, a stack-based buffer overflow condition could occur in the worker process.

An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted system. When processed, the request could allow the attacker to execute arbitrary code in the security context of the affected application.
 
Safeguards
Administrators are advised to apply the appropriate updates.

Administrators are advised to allow only trusted users to have network access.

Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.

Administrators are advised to monitor affected systems.
 
Patches/Software
Nginx.org has released a patch at the following link: Nginx Web Server

FreeBSD has updated the ports collection index at the following link: Ports Collection Index
 
Alert History
 
Initial Release


Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Nginx.orgNginx Web Server 1.3 .9 | 1.4 .0

Associated Products:
FreeBSD ProjectFreeBSD 6.3 Base | 6.4 Base | 7.0 Base | 7.1 Base | 7.2 Base | 7.3 Base | 7.4 Base | 8.0 Base | 8.1 Base | 8.2 Base | 8.3 Base | 9.0 Base | 9.1 Base




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LEGAL DISCLAIMER
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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