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QEMU: file corruption via 9pfs
Synthesis of the vulnerability
A local attacker can create a symbolic link, in order to access files with the privileges of QEMU on the host system.
Impacted products: QEMU, Ubuntu.
Creation date: 17/01/2017.
Revision date: 17/02/2017.
Identifiers: 1035, CVE-2016-9602, USN-3261-1, USN-3268-1, VIGILANCE-VUL-21595.
Description of the vulnerability
The QEMU product implements the filesystem from Plan 9 named "9pfs".
It may be used to share files between the host and process in the guest system in QEMU. However, when QEMU follows a symbolic link, it does not distinguish between filenames and directory names. This allows a guest process to open a non shared file on the host.
A local attacker can therefore create a symbolic link, in order to access files with the privileges of QEMU on the host system.
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