Apache mod_tcl set_var() format string
| modtcl-setvar-format-string (29550) |  High Risk |
Description:
The mod_tcl Apache Web server module could allow a remote attacker to execute arbitrary commands on the system, caused by a format string vulnerability in the set_var() function. An attacker could exploit this vulnerability by sending a specially-crafted format string to a script using the set_var() function which could allow the attacker to execute arbitrary commands on the vulnerable system with the privileges of the Web server service.
*CVSS:
| Base Score: | 10 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | Complete |
| Integrity Impact: | Complete |
| Availability Impact: | Complete |
| Temporal Score: | 7.4 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Confirmed |
Consequences:
Gain Access
Remedy:
Upgrade to the latest version of mod_tcl (1.0.1 or later), available from the Apache mod_tcl Web site. See References.
For Gentoo Linux:
Refer to Gentoo Linux Security Announcement GLSA 200610-12 for patch, upgrade, or suggested workaround information. See References.
References:
- iDefense Labs PUBLIC ADVISORY: 10.13.06: Apache HTTP Server mod_tcl set_var Format String Vulnerability.
- mod_tcl Web page: mod_tcl - Apache Web Server Module.
- mod_tcl Web site: mod_tcl - Apache Web Server Module.
- BID-20527: Apache Mod_TCL Remote Format String Vulnerability
- CVE-2006-4154: Format string vulnerability in the mod_tcl module 1.0 for Apache 2.x allows context-dependent attackers to execute arbitrary code via format string specifiers that are not properly handled in a set_var function call in (1) tcl_cmds.c and (2) tcl_core.c.
- GLSA-200610-12: Apache mod_tcl: Format string vulnerability
- OSVDB ID: 29536: Apache Tcl mod_tcl set_var Function Remote Format String
- SA22458: Apache HTTP Server mod_tcl Format String Vulnerabilities
- SECTRACK ID: 1017062: Apache mod_tcl Format String Bug in set_var() Function May Let Remote Users Execute Arbitrary Code
- US-CERT VU#366020: Apache mod_tcl module contains a format string error
- VUPEN/ADV-2006-4033: Mod_tcl Module for Apache HTTP Server Remote Format String Vulnerability
Platforms Affected:
- Gentoo Linux
- Tcl Developer Exchange mod_tcl 1.0
Reported:
Oct 13, 2006
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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.