Date: Thu, 10 Oct 2013 12:22:45 +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@....org> Subject: Xen Security Advisory 68 (CVE-2013-4369) - possible null dereference when parsing vif ratelimiting info -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Xen Security Advisory CVE-2013-4369 / XSA-68 version 2 possible null dereference when parsing vif ratelimiting info UPDATES IN VERSION 2 ==================== Public release. ISSUE DESCRIPTION ================= The libxlu library function xlu_vif_parse_rate does not properly handle inputs which consist solely of the '@' character, leading to a NULL pointer dereference. IMPACT ====== A toolstack which allows untrusted users to specify an arbitrary configuration for the VIF rate can be subjected to a DOS. The only known user of this library is the xl toolstack which does not have a central long running daemon and therefore the impact is limited to crashing the process which is creating the domain, which exists only to service a single domain. VULNERABLE SYSTEMS ================== The vulnerable code is present from Xen 4.2 onwards. MITIGATION ========== Disallowing untrusted users from specifying arbitrary VIF rate limits will avoid this issue. CREDITS ======= This issue was discovered by Coverity Scan and Matthew Daley. RESOLUTION ========== Applying the attached patch resolves this issue in all branches xsa68.patch xen-unstable, Xen 4.3.x, Xen 4.2.x $ sha256sum xsa68*.patch 64716cb49696298e0bbd9556fe9d6f559a4e2785081e28d50607317b6e27ba32 xsa68.patch $ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAEBAgAGBQJSVpv6AAoJEIP+FMlX6CvZh5AH/3eMQvmLfgXNbr/vBFKwwJFc FXd/5N76S17ZI5jTPLoXc1GiXOI9MhPNazKo6e/RLYkVrxgK4Cq8jowBJBgg8Q4R egOlTinu87uT3ik6DP1ZQVQXEC2Wot0lJwjkN5B/72Tx/ldnS7i/Wi7P5QW7kzcJ 3FWSoCP/degKK/pBbPbt6keUjsUgkIXR3S0Vx/5+NXWeGMfjBFMqV6O1TQ1COkjw GrvYzXBPAnhmw0fUSYdh87Ed2MH0nZqBGuP/b4wlXqoYWBZN/1xs8M+txnfGLyRm +vvoM5shs+IiC0cVUcOPF+o7xZRiF6ZNdEMZdMV0NPHNeVEKtdXd6zlc/7VWuvM= =9/V5 -----END PGP SIGNATURE----- Download attachment "xsa68.patch" of type "application/octet-stream" (1923 bytes)
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