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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0572 Shibboleth Service Provider patches critical security vulnerability 28 February 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Shibboleth Service Provider Publisher: Shibboleth Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Access Privileged Data -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-0489 Reference: ESB-2018.0571 Original Bulletin: https://shibboleth.net/community/advisories/secadv_20180227.txt Comment: The vendor notes that this vulnerability is present in multiple SAML libraries, not just Shibboleth. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Shibboleth Service Provider Security Advisory [27 February 2018] An updated version of the Shibboleth Project's XMLTooling library is available which corrects a critical security issue. Shibboleth SP software vulnerable to additional data forgery flaws ==================================================================== The XML processing performed by the Service Provider software has been found to be vulnerable to new flaws similar in nature to the one addressed in an advisory last month [1]. These bugs involve the use of other XML constructs rather than entity references, and therefore required additional mitigation once discovered. As with the previous issue, this flaw allows for changes to an XML document that do not break a digital signature but can alter the user data passed through to applications behind the SP and result in impersonation attacks and exposure of protected information. As before, the use of XML Encryption is a significant mitigation, but we have not dismissed the possibility that attacks on the Response "envelope" may be possible, in both the original and this new case. No actual attacks of this nature are known, so deployers should prioritize patching systems that expect to handle unencrypted SAML assertions. An updated version of XMLTooling-C (V1.6.4) is available [2] that protects against these new attacks, and should help prevent similar vulnerabilities in the future. Unlike the previous case, these bugs are NOT prevented by any existing Xerces-C parser version on any platform and cannot be addressed by any means other than the updated XMLTooling-C library. ALL supported (and unsupported) platforms are impacted by these bugs, including Windows, Linux, Solaris, and OS X. This vulnerability has been assigned CVE-2018-0489 and is referenced by a CERT Vulnerability Note at [3]. Recommendations =============== Upgrade to V1.6.4 or later of the XMLTooling-C library and restart the affected processes (shibd, Apache, etc.) Linux installations relying on official RPM packages can upgrade to the latest package versions to obtain the fix. The MacPort has also been updated. Windows systems can upgrade to the latest Service Provider release (V2.6.1.4) which contains the appropriately updated libraries. [4] Credits ======= Kelby Ludwig, Duo Security Scott Cantor, Shibboleth Project [1] https://shibboleth.net/community/advisories/secadv_20180112.txt [2] https://shibboleth.net/downloads/c++-opensaml/2.6.1/ [3] https://www.kb.cert.org/vuls/id/475445 [4] https://shibboleth.net/downloads/service-provider/2.6.1/ URL for this Security Advisory: https://shibboleth.net/community/advisories/secadv_20180227.txt - -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAEBCAAGBQJalLrIAAoJEDeLhFQCJ3ligHYP/3f0XgFxgUUnUk0p3HEFR9Rl 5YLrY7Y0EP7Tc+NjEBgKBSyyuFu8neWm44+7HNWPjvP4VmncEWyUTn4Xw1xbCXaA ykXe9VCDDeYFZP6y3u7dUFKMC6Z02xjwRAjjLfmR6KDzpmzIlZnxMQhWU10c8hBK /dqpUEcsYD6EDBm9JucUjb8Cj7WFZRaO/5/BzdZU84cmRpavvuUHcIs6xkyP4AuA rYPF708C8cflY6uGSADeMRmwhiqD2fdFurUouJp+m6WR/llm0xRpnOQmLISZwHOR +1hQc4FHy8LMPLAOY0z8HZl+WfVIW8J6LklZZclBA0RqiuO3kGIAC+7IDSQvq9dE W8Ak1XKPIYpXsYeMUYKyknrT95/aaUdN5TFN+yqrqu9wJuahhOkCPfPVBvrOgcuI 7GIcivt8DarBv/UVNbp9Gi2LD3EFbCadd53bkNXMA18KeMPyYR1b7Gxt/3vc1AJ0 LrqUZxrQAAbtQqOPsgVi0FftHV0R/WAHhEb3/KHA0x/Cy9vlgW0uUzQh43aKOzV1 +z9/mP3Sg1C9gtQZ6ltrL5YPZtAqR5tFakXcZd4D6CYNYpVOcSYZbPqNZxN+Rv1V f4SoV+zAmV+x0RiZzVemPtybi+ZNKWfvCNkpdzTxWPLsLA9Lv2PVYtlePPkFrmHC Zi+h/9CxnoOSSesMVtEp =AkPz - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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