Libvirt Security Notice: LSN-2013-0020 ====================================== Summary: libvirtd crash when hot-plugging disks for qemu domains Reported on: 20131220 Published on: 20131213 Fixed on: 20140107 Reported by: Alexandre M <alexandre.mclean(a)ubisoft.com&gt; Patched by: Jiri Denemark <jdenemar(a)redhat.com&gt; See also: CVE-2013-6458, redhat bug #1043069 Description ----------- Several methods in the qemu block driver were accessing details about disks associated with a domain outside of a job lock. If another connection is adding or removing disks, the details in use by the first connection could become stale and lead to a libvirtd crash. Among the methods impacted, it is possible to trigger the race from four APIs accessible from read-only clients: virDomainBlockStats, virDomainGetBlockInfo, virDomainGetBlockJobInfo, and virDomainGetBlockIoTune. Impact ------ Each of the four affected APIs could be used by any user that can connect through the read-only libvirtd UNIX domain socket. Also, if ACLs are active, access to the affected APIs is granted to any user with the 'read' permission on the 'domain' object, which is granted by default to all users. As a result an unprivileged user will be able to inflict a denial of service attack on other users of the libvirtd daemon with higher privilege. Workaround ---------- The impact can be mitigated by blocking access to the read-only libvirtd UNIX domain socket, with policykit or the 'auth_unix_ro' parameter in '/etc/libvirt/libvirtd.conf'. If ACLs are active, the 'read' permission should be removed from any untrusted users. This will not prevent the crash, but will stop unprivileged users from inflicting the denial of service on higher privileged users. Additionally, avoiding disk hot-plug actions is sufficient to avoid the problem. Affected product ---------------- Name: libvirt Repository: git://libvirt.org/git/libvirt.git http://libvirt.org/git/?p=libvirt.git Branch: master Broken in: v0.8.2 Broken in: v0.8.3 Broken in: v0.8.4 Broken in: v0.8.5 Broken in: v0.8.6 Broken in: v0.8.7 Broken in: v0.8.8 Broken in: v0.9.0 Broken in: v0.9.1 Broken in: v0.9.2 Broken in: v0.9.3 Broken in: v0.9.4 Broken in: v0.9.5 Broken in: v0.9.6 Broken in: v0.9.7 Broken in: v0.9.8 Broken in: v0.9.9 Broken in: v0.9.10 Broken in: v0.9.11 Broken in: v0.9.12 Broken in: v0.9.13 Broken in: v0.10.0 Broken in: v0.10.1 Broken in: v0.10.2 Broken in: v1.0.0 Broken in: v1.0.1 Broken in: v1.0.2 Broken in: v1.0.3 Broken in: v1.0.4 Broken in: v1.0.5 Broken in: v1.0.6 Broken in: v1.1.0 Broken in: v1.1.1 Broken in: v1.1.2 Broken in: v1.1.3 Broken in: v1.1.4 Broken in: v1.2.0 Fixed in: v1.2.1 Broken by: ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Broken by: 18c2a592064d69499f70428e498f4a3cb5161cda Broken by: b976165ca4d82788be77d14843a4d079139539ba Broken by: eca96694a7f992be633d48d5ca03cedc9bbc3c9a Fixed by: db86da5ca2109e4006c286a09b6c75bfe10676ad Fixed by: b799259583bd65c0b2f5042e6c3ff19637ade881 Fixed by: f93d2caa070f6197ab50d372d286018b0ba6bbd8 Fixed by: 3b56425938e2f97208d5918263efa0d6439e4ecd Branch: v0.8.3-maint Broken by: ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Branch: v0.9.6-maint Broken in: v0.9.6.1 Broken in: v0.9.6.2 Broken in: v0.9.6.3 Broken in: v0.9.6.4 Broken by: ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Broken by: 18c2a592064d69499f70428e498f4a3cb5161cda Broken by: b976165ca4d82788be77d14843a4d079139539ba Branch: v0.9.11-maint Broken in: v0.9.11.1 Broken in: v0.9.11.2 Broken in: v0.9.11.3 Broken in: v0.9.11.4 Broken in: v0.9.11.5 Broken in: v0.9.11.6 Broken in: v0.9.11.7 Broken in: v0.9.11.8 Broken in: v0.9.11.9 Broken in: v0.9.11.10 Broken by: ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Broken by: 18c2a592064d69499f70428e498f4a3cb5161cda Broken by: b976165ca4d82788be77d14843a4d079139539ba Broken by: 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ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Broken by: 18c2a592064d69499f70428e498f4a3cb5161cda Broken by: b976165ca4d82788be77d14843a4d079139539ba Broken by: eca96694a7f992be633d48d5ca03cedc9bbc3c9a Fixed by: 84c251faec7a0003863fe1c9b1abc7960f395faa Fixed by: 3451828a28a333e570af621eceb93245763fa044 Fixed by: 571629b2dfd2eeb8001efddac2569b12621d1db3 Fixed by: c5b379e17daa2f641363712212a18b3b31cacdea Branch: v1.1.2-maint Broken by: ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Broken by: 18c2a592064d69499f70428e498f4a3cb5161cda Broken by: b976165ca4d82788be77d14843a4d079139539ba Broken by: eca96694a7f992be633d48d5ca03cedc9bbc3c9a Fixed by: 17db7e28a1ec77382bb8fa96205ef2cf6deefa88 Fixed by: 54cb7f05ec5c822bb786833367dc80327648f2c0 Fixed by: bcb9a035a99cf8389069c401c94605aedccdc4df Fixed by: 82daa87f6a020ba2d1274b300f8e95f903fbe0f8 Branch: v1.1.3-maint Broken in: v1.1.3.1 Broken in: v1.1.3.2 Fixed in: v1.1.3.3 Broken by: ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Broken by: 18c2a592064d69499f70428e498f4a3cb5161cda Broken by: b976165ca4d82788be77d14843a4d079139539ba Broken by: eca96694a7f992be633d48d5ca03cedc9bbc3c9a Fixed by: 1bfc35e3f837ab7b399fe664281b7db06db96a05 Fixed by: 0e98442e3bcbf832f49a6d36f94558bb026e3f3a Fixed by: 7354aaf4607beaa9f4a6d68e3b26a28c97494e58 Fixed by: a7844b9ec2718dad9f5e5316cc0673e95098d812 Branch: v1.1.4-maint Broken by: ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Broken by: 18c2a592064d69499f70428e498f4a3cb5161cda Broken by: b976165ca4d82788be77d14843a4d079139539ba Broken by: eca96694a7f992be633d48d5ca03cedc9bbc3c9a Fixed by: c8fa19d9e385d8bae368385aece1c3f493be4e71 Fixed by: 4ee6ed6f50a71868fbb8a5f28edbcfd7170f5bf5 Fixed by: 36c1691c6d61aa5a0d9a65d64bc3af3e15692d62 Fixed by: 8fcc0f0237f728361065caf6fac0fce1965230a0 Branch: v1.2.0-maint Broken by: ebb0c19c48690f0598de954f8e0e9d4d29d48b85 Broken by: 18c2a592064d69499f70428e498f4a3cb5161cda Broken by: b976165ca4d82788be77d14843a4d079139539ba Broken by: eca96694a7f992be633d48d5ca03cedc9bbc3c9a Fixed by: 13051a86cb093d4c421a8669ccd7591578d004aa Fixed by: 3a0286f978c19ecc7b2ef2242b33688239428f85 Fixed by: 4d8c603ca2cb1fb70c0e0d2e0d51d1fe3261c7b9 Fixed by: c6fbbe85aa496d178d5e4188bee166a5abb97029 -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org