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SS-2015-021: Hash rewrite URL filtering

Severity:
Moderate (?)
Identifier:
SS-2015-021
Versions Affected:
3.1.15 and below, 3.2.0
Versions Fixed:
3.1.16, 3.2.1
Release Date:
2015-11-16

When SSViewer rewrites has links, it takes the whole URL after the base and prepends it to the hash. So for http://example.com/foo, links like "#" become "/foo#". This prevents them being interpreted as relative to the base tag (i.e. as "http://example.com/#")

However this URL isn't well filtered, so a URL like http://example.com//evil.com will have it's hash links be rewritten to be "//evil.com#"

This fix has been resolved by pre-filtering $_SERVER['REQUEST_URI'] to clean leading double-slashes which would otherwise denote such urls as protocol-relative links.

Common Vulnerability Scoring System (CVSS) Information