Apache HTTP Server mod_proxy information disclosure

apache-modproxy-information-disclosure (70336) The risk level is classified as MediumMedium Risk

Description:

Apache HTTP Server could allow a remote attacker to obtain sensitive information, caused by an error in mod_proxy when configured in reverse proxy mode and using the RewriteRule or ProxyPassMatch directives with a pattern match. By sending specially-crafted requests, a remote attacker could exploit this vulnerability to gain unauthorized access to internal servers to obtain sensitive information.

*CVSS:

Base Score: 5
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Partial
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 3.9
  Exploitability: Proof-of-Concept
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Obtain Information

Remedy:

Apply the patch for this vulnerability, available from the Apache Web site. See References.

For other distributions:
Apply the appropriate update for your system. See References.

References:

  • Apache Web site: SECURITY (CVE-2011-3368): Prevent unintended pattern expansion in some reverse proxy configurations by strictly validating the request-URI..
  • Apple KB HT5501: About the security content of OS X Mountain Lion v10.8.2, OS X Lion v10.7.5 and Security Update 2012-004.
  • Fujitsu Web site: Interstage HTTP Server: Two Security Vulnerabilities (CVE-2011-3368/ CVE-2011-0419). October 31st, 2011.
  • Full-disclosure Mailing List, Wed, 5 Oct 2011 14:58:02 +0000: Apache HTTP Server: mod_proxy reverse proxy exposure (CVE-2011-3368).
  • HP Security Bulletin HPSBMU02748 SSRT100772 rev.1: HP OpenView Network Node Manager (OV NNM) Running Apache HTTP Server, Remote Unauthorized Disclosure of Information, Unauthorized Modification, Denial of Service (DoS).
  • HP Security Bulletin HPSBOV02822 SSRT100966: HP Secure Web Server (SWS) for OpenVMS, Remote Denial of Service (DoS), Unauthorized Access, Disclosure of Information.
  • IBM APAR PM47852: mod_proxy_ajp: Respond with HTTP_NOT_IMPLEMENTED when the method is not recognized..
  • IBM APAR PM48384: Potential pattern expansion problem when mod_proxy and mod_rewrite are used together..
  • IBM APAR PM50426: Potential buffer overflow and high memory usage in IBM HTTP Server..
  • IBM Support & Downloads: Fix list for IBM HTTP Server Version 7.0.
  • Offensive Security Exploit Database [10-11-2011]: Apache mod_proxy Reverse Proxy Exposure Vulnerability PoC.
  • Oracle Critical Patch Update Advisory - July 2012: Oracle Critical Patch Update Advisory - July 2012.
  • Oracle Critical Patch Update Advisory - July 2012: Oracle Critical Patch Update Advisory - July 2012.
  • BID-49957: Apache HTTP Server 'mod_proxy' Reverse Proxy Information Disclosure Vulnerability
  • CVE-2011-3368: The mod_proxy module in the Apache HTTP Server 1.3.x through 1.3.42, 2.0.x through 2.0.64, and 2.2.x through 2.2.21 does not properly interact with use of (1) RewriteRule and (2) ProxyPassMatch pattern matches for configuration of a reverse proxy, which allows remote attackers to send requests to intranet servers via a malformed URI containing an initial @ (at sign) character.
  • DSA-2405: apache2 -- multiple issues
  • OSVDB ID: 76079: Apache HTTP Server mod_proxy Mdule Web Request URL Parsing Proxy Remote Security Bypass (2011-3368)
  • RHSA-2011-1391: Moderate: httpd security and bug fix update
  • RHSA-2011-1392: Moderate: httpd security and bug fix update
  • RHSA-2012-0542: Moderate: httpd security and bug fix update
  • SA46288: Apache HTTP Server mod_proxy Reverse Proxy Mode Security Bypass Weakness
  • SA46414: IBM OS/400 HTTP Server mod_proxy Reverse Proxy Mode Security Bypass Weakness
  • SA46648: Fujitsu Interstage HTTP Server Two Vulnerabilities
  • SA47606: IBM HTTP Server Multiple Vulnerabilities
  • SA48551: HP OpenView Network Node Manager Apache HTTP Server Multiple Vulnerabilities
  • SA50922: HP Secure Web Server for OpenVMS Multiple Vulnerabilities

Platforms Affected:

  • Apache HTTP Server 2.2.12
  • Apache HTTP Server 2.2.13
  • Apache HTTP Server 2.2.14
  • Apache HTTP Server 2.2.15
  • Apache HTTP Server 2.2.16
  • Apache HTTP Server 2.2.17
  • Apache HTTP Server 2.2.18
  • Apache HTTP Server 2.2.19
  • Apache HTTP Server 2.2.20
  • Apache HTTP Server 2.3.0
  • Apache HTTP Server 2.3.1
  • Apache HTTP Server 2.3.2
  • Apache HTTP Server 2.3.4
  • Apache HTTP Server 2.3.5
  • Apache HTTP Server 2.3.6
  • Apple Mac OS X 10.6
  • Apple Mac OS X Server 10.6
  • FUJITSU Interstage Application Server 5.x
  • FUJITSU Interstage Application Server 6.x
  • FUJITSU Interstage Application Server 7.x
  • FUJITSU Interstage Application Server 8.x
  • FUJITSU Interstage Application Server 9.x
  • FUJITSU Interstage Apworks 6.x
  • FUJITSU Interstage Apworks 7.x
  • FUJITSU Interstage Business Application Server 8.x
  • FUJITSU Interstage Studio 8.x
  • FUJITSU Interstage Studio 9.x
  • HP OpenView Network Node Manager 7.0.1
  • HP OpenVMS Secure Web Server 2.2
  • IBM HTTP Server 7.0
  • IBM OS 400 5.1
  • IBM OS 400 5.2
  • IBM OS 400 5.3
  • IBM OS 400 5.3.5
  • IBM OS 400 6.x
  • JBoss Enterprise Web Server
  • RedHat Enterprise Linux 4 ES
  • RedHat Enterprise Linux 4 AS
  • RedHat Enterprise Linux 4 Desktop
  • RedHat Enterprise Linux 4 WS
  • RedHat Enterprise Linux 5 Client
  • RedHat Enterprise Linux 5
  • RedHat Enterprise Linux 5 Client Workstation
  • RedHat Enterprise Linux 6 Workstation
  • RedHat Enterprise Linux 6 Server
  • RedHat Enterprise Linux Desktop 6
  • RedHat Enterprise Linux HPC Node 6
  • RedHat Enterprise Linux Server EUS 6.1.z

Reported:

Oct 05, 2011

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