Squid strListGetItem() denial of service
| squid-strlistgetitem-dos (52610) |  Low Risk |
Description:
Squid is vulnerable to a denial of service, caused by an error in the strListGetItem() function when parsing external authentication headers when the external_acl_type configuration option defines a delimiter other than a comma. A remote attacker could exploit this vulnerability via an authentication header containing a comma delimiting character to cause an infinite loop.
*CVSS:
| Base Score: | 5 |
| Access Vector: | Network |
| Access Complexity: | Low |
| Authentication: | None |
| Confidentiality Impact: | None |
| Integrity Impact: | None |
| Availability Impact: | Partial |
| Temporal Score: | 4 |
| Exploitability: | Unproven |
| Remediation Level: | Unavailable |
| Report Confidence: | Uncorroborated |
Consequences:
Denial of Service
Remedy:
Apply the appropriate patch for your system. See References.
References:
- Squid Bugzilla ¿ Bug 2541: Hang in 100% CPU loop while extacting header details using a delimiter other than comma.
- BID-36091: Squid Web Proxy Cache Authentication Header Parsing Remote Denial of Service Vulnerability
- CVE-2009-2855: The strListGetItem function in src/HttpHeaderTools.c in Squid 2.7 allows remote attackers to cause a denial of service via a crafted auth header with certain comma delimiters that trigger an infinite loop of calls to the strcspn function.
- MDVSA-2009:241: squid
- MDVSA-2009:241-1: squid
- SA36378: Squid "strListGetItem()" Denial of Service Vulnerability
- SECTRACK ID: 1022757: Squid Infinite Loop in strListGetItem() Lets Remote Users Deny Service
Platforms Affected:
- MandrakeSoft Mandrake Linux 2008.0
- MandrakeSoft Mandrake Linux 2008.0 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 3.0
- MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 4.0
- MandrakeSoft Mandrake Multi Network Firewall 2.0
- Squid-Cache Squid 2.7.STABLE3
- Turbolinux Turbolinux 10 Server
- Turbolinux Turbolinux 10 Server x64 Ed
- Turbolinux Turbolinux 11 Server
- Turbolinux Turbolinux 11 Server x64 Ed
- Turbolinux Turbolinux Appliance Server 2.0
Reported:
Aug 20, 2009
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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.