opensaml_3.2.1-3+deb12u1_source.changes ACCEPTED into proposed-updates

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Format: 1.8
Date: Fri, 14 Mar 2025 21:47:50 +0100
Source: opensaml
Architecture: source
Version: 3.2.1-3+deb12u1
Distribution: bookworm-security
Urgency: high
Maintainer: Debian Shib Team <pkg-shibboleth-devel at alioth-lists.debian.net>
Changed-By: Ferenc Wágner <wferi at debian.org>
Closes: 1100464
Changes:
 opensaml (3.2.1-3+deb12u1) bookworm-security; urgency=high
 .
   * [b3e86fd] New patch: CPPOST-126 - Simple signature verification fails to
     detect parameter smuggling.
     Security fix cherry-picked from v3.3.1 (upstream commit
     22a610b322e2178abd03e97cdbc8fb50b45efaee).
     Parameter manipulation allows the forging of signed SAML messages
     =================================================================
     A number of vulnerabilities in the OpenSAML library used by the
     Shibboleth Service Provider allowed for creative manipulation of
     parameters combined with reuse of the contents of older requests
     to fool the library's signature verification of non-XML based
     signed messages.
     Most uses of that feature involve very low or low impact use cases
     without critical security implications; however, there are two
     scenarios that are much more critical, one affecting the SP and
     one affecting some implementers who have implemented their own
     code on top of our OpenSAML library and done so improperly.
     The SP's support for the HTTP-POST-SimpleSign SAML binding for
     Single Sign-On responses is its critical vulnerability, and
     it is enabled by default (regardless of what one's published
     SAML metadata may advertise).
     The other critical case involves a mistake that does *not*
     impact the Shibboleth SP, allowing SSO to occur over the
     HTTP-Redirect binding contrary to the plain language of the
     SAML Browser SSO profile. The SP does not support this, but
     other implementers may have done so.
     Contrary to the initial publication of this advisory, there is no
     workaround within the SP configuration other than to remove the
     "SimpleSigning" security policy rule from the security-policy.xml
     file entirely.
     That will also prevent support of legitimate signed requests or
     responses via the HTTP-Redirect binding, which is generally used
     only for logout messages within the SP itself. Removing support
     for that binding in favor of HTTP-POST in any published metadata
     is an option of course.
     Full advisory:
     https://shibboleth.net/community/advisories/secadv_20250313.txt
     Thanks to Scott Cantor (Closes: #1100464)
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