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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3981 Multiple vulnerabilities found in Xen 24 November 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Xen Publisher: Xen Operating System: Virtualisation Impact/Access: Increased Privileges -- Existing Account Denial of Service -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-28703 Original Bulletin: http://xenbits.xen.org/xsa/advisory-387.html - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory CVE-2021-28703 / XSA-387 version 2 grant table v2 status pages may remain accessible after de-allocation (take two) UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Guest get permitted access to certain Xen-owned pages of memory. The majority of such pages remain allocated / associated with a guest for its entire lifetime. Grant table v2 status pages, however, get de-allocated when a guest switched (back) from v2 to v1. The freeing of such pages requires that the hypervisor know where in the guest these pages were mapped. The hypervisor tracks only one use within guest space, but racing requests from the guest to insert mappings of these pages may result in any of them to become mapped in multiple locations. Upon switching back from v2 to v1, the guest would then retain access to a page that was freed and perhaps re-used for other purposes. This bug was fortuitously fixed by code cleanup in Xen 4.14, and backported to security-supported Xen branches as a prerequisite of the fix for XSA-378. IMPACT ====== A malicious guest may be able to elevate its privileges to that of the host, cause host or guest Denial of Service (DoS), or cause information leaks. VULNERABLE SYSTEMS ================== All Xen branches up to and including 4.13 are vulnerable, but only if the patches for XSA-378 have not been applied. Xen versions 4.13.4, 4.14.x and 4.15.x are not affected. Only x86 HMV and PVH guests permitted to use grant table version 2 interfaces can leverage this vulnerability. x86 PV guests cannot leverage this vulnerability. On Arm, grant table v2 use is explicitly unsupported. MITIGATION ========== Running only PV guests will avoid this vulnerability. Suppressing use of grant table v2 interfaces for HVM or PVH guests will also avoid this vulnerability. CREDITS ======= This issue was discovered by Patryk Balicki and Julien Grall of Amazon. RESOLUTION ========== Applying the following patch resolves the issue: x86/p2m: don't assert that the passed in MFN matches for a remove This patch was supplied with XSA-378, as one of 378's prerequisites. The fix has already been applied to Xen stable branches as follows: c65ea16dbcafbe4fe21693b18f8c2a3c5d14600e in Xen 4.14.x, 4.15.x f50fbddbae81fcccae56d27317bd71cc0e678ba2 in Xen 4.13.4 d44643199c96ac22491ae002d3bcd1c989b95ea4 in xen.git#stable-4.12 66f400c71d12fe8adfb895984b14f2941e8cb6ce in xen.git#stable-4.11 DEPLOYMENT DURING EMBARGO ========================= Deployment of the patches and/or mitigations described above (or others which are substantially similar) is permitted during the embargo, even on public-facing systems with untrusted guest users and administrators. But: Distribution of updated software is prohibited (except to other members of the predisclosure list). Predisclosure list members who wish to deploy significantly different patches and/or mitigations, please contact the Xen Project Security Team. (Note: this during-embargo deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable. This is to enable the community to have oversight of the Xen Project Security Team's decisionmaking.) For more information about permissible uses of embargoed information, consult the Xen Project community's agreed Security Policy: http://www.xenproject.org/security-policy.html - -----BEGIN PGP SIGNATURE----- iQFABAEBCAAqFiEEI+MiLBRfRHX6gGCng/4UyVfoK9kFAmGc2jgMHHBncEB4ZW4u b3JnAAoJEIP+FMlX6CvZlWUIAJ4bU9n2q9A4sqhiW0xJOCI4MIdwV2ym6xziP9iN e5sg0u3gdp94M1vLf//8h7julxLXgdJd10HWWpJkfRQcsfz3E1ul1O+mAsoHxJwI /qGl1Xis7AkDFjrPXthJUKh/DNgi8F1Rok7XDbfFznk34v4g6anh4JDfqJIUwIFQ l2s6qIOc2PjvmrJMXEboT1wEUADZNtChIqOL7Ibre9Zz6/mdr0FjPfPvLAqfvf9m aLaMElJMRx5iTEUG7qCYXUn8oKLbWNTv88yceudE7QZl3/zv/UnEL8nvBZWs/Gkx UbrC6wkNFUSpF/ngexvzsSE/SrfMYYaUPfIciyuxvuosGJY= =DmKh - -----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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYZ2ZXeNLKJtyKPYoAQj19A/9FztRrPOrFqVyVRlhZ9xYSnLH5J6b8Pc/ 5WfFIF55PumIATZGfDBoNx4Vt/tJMW2Zr5sYMxKTlGjVP4cvREAhg9ogqhJsMpjR l0mAN1N4sRKNjYsDNTZKm/meXc+yJiL7DuI6lp4tpxVn0n1nhdodhjZ0OAVkclDY gjI25mETSaSuC2yKmGXnZo2jGb7Ae124+beB41Ph3mvc0CKMDwx5dBoa54LZNzNa w8iNU47Kt/F2n/5vG9X6+BXjxEDvi7UBFthRHMS4u++XCKtfzbxjsvlzUmtdHUlJ zHsDecQuSFWLZxVcvBN3ZYTJ+O1Zcm7xy1h1GYZCSCVK1zDrMBlMuBsJFRstEFNf Ygu3AdFhQ0v2HiuX3/1X0X2VsvTBCSCUOpvH9mayc7z2XsnIql9ZAprnPjDAk/Qp /FJ2KfDc+1qKCkHcL7FXnES3tt0LlG4tQddtGp664pngzmYBRrtNq6+43ipuSknV 1B+/NrxGg7dgVnmVW3o5mog+dNJzZu54vWQmuP45qMRVdqcrrQE9ApT2ylvDPuE2 2Eg2ZjTQ3VOoEal9TTBliDfr51tXjY4EeGk5FAM66xd5/Ce0/dGD9SOqGZmxYbA4 w1rKT82NIpmgdslOFkiXnhn8RdoyNaOCw4zRtGnhZljuZK0TFD5LVLlF7qsbmNN+ OPY2qRYHLW4= =hqCi -----END PGP SIGNATURE-----