CVE-2013-2218: Double Free
First published: Mon Jul 01 2013(Updated: )
Daniel P. Berrange reported: "As non-root, simply run: # virsh -c qemu:///system --readonly iface-list --inactive The libvirtd daemon will crash with one of a number of different stack traces, for example: *** Error in `/home/berrange/src/virt/libvirt/daemon/.libs/lt-libvirtd': invalid fastbin entry (free): 0x00007f03fc02a1b0 *** ======= Backtrace: ========= /lib64/libc.so.6(+0x3cd5e7cef8)[0x7f0425cf7ef8] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virFree+0x2e)[0x7f04293fd79e] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virLogVMessage+0x37d)[0x7f042942384d] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virLogMessage+0x97)[0x7f0429423b27] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virObjectUnref+0x65)[0x7f04294324d5] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virIdentitySetCurrent+0x35)[0x7f042941ae25] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(virNetServerProgramDispatch+0x392)[0x7f0429539be2] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(+0x195d68)[0x7f0429533d68] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(+0xa62e5)[0x7f04294442e5] /home/berrange/src/virt/libvirt/src/.libs/libvirt.so.0(+0xa594e)[0x7f042944394e] /lib64/libpthread.so.0(+0x3cd6207c53)[0x7f0426449c53] /lib64/libc.so.6(clone+0x6d)[0x7f0425d6fecd] Looking at the code, we have a double-free of the 'struct netcf_if' object when any of the filtering flags are set. Hence this only happens if you pass '--inactive' to virsh." Upstream fix: <a href="http://libvirt.org/git/?p=libvirt.git;a=commit;h=244e0b8cf15ca2ef48d82058e728656e6c4bad11">http://libvirt.org/git/?p=libvirt.git;a=commit;h=244e0b8cf15ca2ef48d82058e728656e6c4bad11</a> Acknowledgements: This issue was discovered by Daniel P. Berrange of Red Hat.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Redhat Libvirt | =1.0.6 |
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Reference Links
- http://libvirt.org/git/?p=libvirt.git%3Ba=commit%3Bh=244e0b8cf15ca2ef48d82058e728656e6c4bad11
- http://libvirt.org/news.html
- http://www.openwall.com/lists/oss-security/2013/07/01/6
- https://bugzilla.redhat.com/show_bug.cgi?id=980112
- http://libvirt.org/git/?p=libvirt.git;a=commit;h=244e0b8cf15ca2ef48d82058e728656e6c4bad11
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=980118
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