Package: src:shibboleth-sp Version: 3.0.2+dfsg1-1 Severity: important Tags: upstream patch security Forwarded: https://issues.shibboleth.net/jira/browse/SSPCPP-922
Shibboleth Service Provider Security Advisory [17 March 2021] An updated version of the Service Provider software is available which fixes a phishing vulnerability. Template generation allows external parameters to override placeholders ====================================================================== The SP includes a primitive template engine used to render error pages and various other status or transition pages, and it supports a syntax for embedding placeholders that are replaced by internally supplied values or configuration settings. For reasons that are unclear in the code history, it was extended to allow replacement via query parameters also, though this is not a typical need. Because of this feature, it's possible to cause the SP to display some templates containing values supplied externally by URL manipulation. Though the values are encoded to prevent script injection, the content nevertheless appears to come from the server and so would be interpreted as trustworthy, allowing email addresses, logos, or support URLs to be manipulated by an attacker. All platforms are impacted by this issue. Recommendations =============== Update to V3.2.1 or later of the Service Provider software, which is now available. The update adds a new <Errors> setting to the configuration called externalParameters, which defaults to false. When false, support for this "feature" is disabled. In the unlikely event that a valid need for this exists, the setting can be enabled temporarily to maintain function until the use case requiring it is addressed in some other way. Other Notes =========== The cpp-sp git commit containing the fix for this issue is d1dbebfadc1bdb824fea63843c4c38fa69e54379 URL for this Security Advisory: https://shibboleth.net/community/advisories/secadv_20210317.txt