BackupPC index.cgi cross-site scripting

backuppc-index-xss (67170) The risk level is classified as MediumMedium Risk


BackupPC is vulnerable to cross-site scripting, caused by improper validation of user-supplied input by the index.cgi script. A remote attacker could exploit this vulnerability using the num or share parameter in a specially-crafted URL to execute script in a victim's Web browser within the security context of the hosting Web site, once the URL is clicked. An attacker could use this vulnerability to steal the victim's cookie-based authentication credentials.


Base Score: 4.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: Partial
  Availability Impact: None
Temporal Score: 3.7
  Exploitability: High
  Remediation Level: Official-Fix
  Report Confidence: Confirmed


Gain Access


Upgrade to the latest version of BackupPC (3.2.1 or later), available from the Web site. See References.


  • HTB22965: Multiple XSS vulnerabilities in BackupPC.
  • Web site: BackupPC.
  • BID-47628: BackupPC 'index.cgi' Multiple Cross Site Scripting Vulnerabilities
  • CVE-2011-5081: Cross-site scripting (XSS) vulnerability in in BackupPC 3.1.0, 3.2.1, and possibly other earlier versions allows remote attackers to inject arbitrary web script or HTML via the share parameter in a RestoreFile action to index.cgi.
  • OSVDB ID: 72055: BackupPC index.cgi share Parameter XSS
  • SA44259: BackupPC num Cross-Site Scripting Vulnerability
  • SA44385: BackupPC share Cross-Site Scripting Vulnerability

Platforms Affected:

  • Craig Barratt BackupPC 3.1.0
  • Craig Barratt BackupPC 3.2.0


Apr 28, 2011

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