CVE-2020-25637 libvirt: double free in qemuAgentGetInterfaces() in qemu_agent.c

[Mauro Matteo Cascella <mcascell () redhat com>]

Hello,

A double free memory issue was found to occur in the libvirt API
responsible for requesting information about network interfaces of a
running QEMU domain. This flaw affects the polkit access control
driver. Specifically, clients connecting to the read-write socket with
limited ACL permissions could use this flaw to crash the libvirt
daemon, resulting in a denial of service, or potentially escalate
their privileges on the system.

CVE-2020-25637 has been assigned for this flaw.

Fixed in libvirt v6.8.0 (2020-10-01).

Upstream commits:
* https://libvirt.org/git/?p=libvirt.git;a=commit;h=955029bd0ad7ef96000f529ac38204a8f4a96401
* https://libvirt.org/git/?p=libvirt.git;a=commit;h=50864dcda191eb35732dbd80fb6ca251a6bba923
* https://libvirt.org/git/?p=libvirt.git;a=commit;h=e4116eaa44cb366b59f7fe98f4b88d04c04970ad
* https://libvirt.org/git/?p=libvirt.git;a=commit;h=a63b48c5ecef077bf0f909a85f453a605600cf05

Credit: Ilja Van Sprundel (IOActive).

Thank you,

-- 
Mauro Matteo Cascella, Red Hat Product Security
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