Adzapper squid_redirect denial of service
| adzapper-squid-redirect-dos (24640) |  Medium Risk |
Description:
Adzapper is vulnerable to a denial of service, caused by improper handling of URLs by the squid_redirect script. A remote attacker behind the proxy server could exploit this vulnerability by sending a specially-crafted URL request containing a long string of forward slash characters to cause CPU resource exhaustion on the proxy host, resulting in a denial of service against other proxy users.
*CVSS:
| Base Score: | 2.1 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Required |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 1.6 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Denial of Service
Remedy:
Upgrade to the latest squid_redirect script (dated 2006-01-29 or later), as listed in the Adzapper CVS log. See References.
For Debian Linux 3.1:
Refer to DSA-966-1 for upgrade information. See References.
For other distributions:
Contact your vendor for patch or upgrade information.
References:
- Adzapper Web page: CVS log for /home/cameron/@/adzapper.sf/html.
- BID-16558: Adzapper Squid_Redirect URI Handling Remote Denial of Service Vulnerability
- CVE-2006-0046: squid_redirect script in adzapper before 2006-01-29 allows remote attackers to cause a denial of service (CPU consumption) via a URL with a large number of trailing / (forward slashes), which might produce inefficient regular expressions.
- DSA-966: adzapper -- denial of service
- OSVDB ID: 22900: Ad Zapping With Squid squid_redirect Crafted URL DoS
- SA18771: Adzapper URL Handling Denial of Service Vulnerability
- VUPEN/ADV-2006-0491: Adzapper squid_redirect URL Handling Denial of Service Vulnerability
Platforms Affected:
- Cameron Simpson Adzapper
- Debian Debian Linux 3.1
Reported:
Feb 09, 2006
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* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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 IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.