Date: Tue, 14 Aug 2018 17:17:59 +0000 From: Xen.org security team <security@....org> To: xen-announce@...ts.xen.org, xen-devel@...ts.xen.org, xen-users@...ts.xen.org, oss-security@...ts.openwall.com CC: Xen.org security team <security-team-members@....org> Subject: Xen Security Advisory 270 v2 - Linux netback driver OOB access in hash handling -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Xen Security Advisory XSA-270 version 2 Linux netback driver OOB access in hash handling UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= Linux's netback driver allows frontends to control mapping of requests to request queues. When processing a request to set or change this mapping, some input validation was missing or flawed. IMPACT ====== A malicious or buggy frontend may cause the (usually privileged) backend to make out of bounds memory accesses, potentially resulting in one or more of privilege escalation, Denial of Service (DoS), or information leaks. VULNERABLE SYSTEMS ================== Linux kernel versions from 4.7 onwards are affected. MITIGATION ========== There is no known mitigation. CREDITS ======= This issue was discovered by Felix Wilhelm of Google Project Zero. RESOLUTION ========== Applying the attached patch resolves this issue. xsa270.patch Linux 4.7 ... 4.17 $ sha256sum xsa270* 392868c37c1fe0d16c36086208fd0fc045c1baf8ab9b207995bce72681cb8c54 xsa270.patch $ 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deployment notice is retained in post-embargo publicly released Xen Project advisories, even though it is then no longer applicable.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----- Version: GnuPG v1 iQEcBAEBCAAGBQJbcw6uAAoJEIP+FMlX6CvZjxgH/iUkqOm+3T+Mr51itOmeOThy J10GbMvqyI8kb7oTVsfHRTMU/zCm01FSCb94B9WXxrKyr3J2RCWygZpS5D5+ujkK w8Ec3tqfRiJ6wXm+SUh+cFeiJBc4BUbTrSgc6VdtNqXO+uGB65CGVqFXTOZfSGMH AJKXQYOYe0gLtGU+H1TrCut6IC5RQKkdbI+gCEgahgc9HnPJnOrJZYoDaXsYCt1l gFPkd1UcVvtGbn+SUjNpXJlpWH8dY2tPeueqgu9LicGZ8jZkGI8FMCfOQ0g9dFMz t0Q8op8N3UAVXsPws+WvbGMuZ9mF71y9y8JUZYKRdg2iLND3CRO+asaMfN+3LSk= =gqkS -----END PGP SIGNATURE----- Download attachment "xsa270.patch" of type "application/octet-stream" (2105 bytes)
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