Apache HTTP Server suEXEC privilege escalation

apache-suexec-privilege-escalation (33584) The risk level is classified as MediumMedium Risk

Description:

The Apache HTTP Server could allow an authenticated local attacker with Apache group privileges to gain elevated privileges, caused by multiple race conditions in the suEXEC utility. If the server process has write access to the document root, an attacker could exploit this vulnerability to rename directories or perform symlink attacks and execute arbitrary code on the system with elevated privileges.

*CVSS:

Base Score: 2.3
  Access Vector: Local
  Access Complexity: High
  Authentication: Required
  Confidentiality Impact: Partial
  Integrity Impact: Partial
  Availability Impact: Partial
 
Temporal Score: 1.9
  Exploitability: Unproven
  Remediation Level: Unavailable
  Report Confidence: Uncorroborated

Consequences:

Gain Privileges

Remedy:

No remedy available as of July 1, 2014.

References:

  • Apache HTTP Server Web site: Welcome! - The Apache HTTP Server Project.
  • iDefense Labs PUBLIC ADVISORY: 04.11.07: Apache HTTPD suEXEC Multiple Vulnerabilities.
  • BID-23438: Apache HTTPD suEXEC Local Multiple Privilege Escalation Weaknesses
  • CVE-2007-1741: Multiple race conditions in suexec in Apache HTTP Server (httpd) 2.2.3 between directory and file validation, and their usage, allow local users to gain privileges and execute arbitrary code by renaming directories or performing symlink attacks. NOTE: the researcher, who is reliable, claims that the vendor disputes the issue because the attacks described rely on an insecure server configuration in which the user has write access to the document root.
  • CVE-2007-1742: suexec in Apache HTTP Server (httpd) 2.2.3 uses a partial comparison for verifying whether the current directory is within the document root, which might allow local users to perform unauthorized operations on incorrect directories, as demonstrated using html_backup and htmleditor under an html directory. NOTE: the researcher, who is reliable, claims that the vendor disputes the issue because the attacks described rely on an insecure server configuration in which the user has write access to the document root.
  • CVE-2007-1743: suexec in Apache HTTP Server (httpd) 2.2.3 does not verify combinations of user and group IDs on the command line, which might allow local users to leverage other vulnerabilities to create arbitrary UID/GID owned files if /proc is mounted. NOTE: the researcher, who is reliable, claims that the vendor disputes the issue because the attacks described rely on an insecure server configuration in which the user has write access to the document root. In addition, because this is dependent on other vulnerabilities, perhaps this is resultant and should not be included in CVE.
  • OSVDB ID: 34872: Apache HTTP Server suexec User/Group Combination Weakness Local Privilege Escalation
  • OSVDB ID: 38639: Apache HTTP Server suexec Multiple Symlink Privilege Escalation
  • OSVDB ID: 38640: Apache HTTP Server suexec Document Root Unauthorized Operations
  • SECTRACK ID: 1017904: Apache suEXEC Bugs May Let Local Users Gain Elevated Privileges

Platforms Affected:

  • Apache HTTP Server 2.2.3

Reported:

Apr 11, 2007

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