Date: Tue, 17 Jan 2017 13:33:51 +0100 From: Greg Kurz <groug@...d.org> To: P J P <ppandit@...hat.com> Cc: oss security list <oss-security@...ts.openwall.com>, Jann Horn <jannh@...gle.com> Subject: Re: CVE-2016-9602 Qemu: 9p: virtfs allows guest to access host filesystem On Tue, 17 Jan 2017 17:48:59 +0530 (IST) P J P <ppandit@...hat.com> wrote: > Hello, > > Quick Emulator(Qemu) built with the VirtFS, host directory sharing via Plan 9 > File System(9pfs) support, is vulnerable to an improper link following issue. > It could occur while accessing symbolic link files on a shared host directory. > > A privileged user inside guest could use this flaw to access host file system > beyond the shared folder and potentially escalating their privileges on a > host. > > Reference: > ---------- > -> http://wiki.qemu.org/Documentation/9psetup > -> https://bugzilla.redhat.com/show_bug.cgi?id=1413929 > > > Please see a proposed patch to fix this issue attached herein. > The proposed patch DOES NOT fix the vulnerability because of a TOCTTOU issue. Please ignore it. I'm working on another fix I hope to complete this week. > This issue was discovered by Jann Horn of Google Project Zero. > > 'CVE-2016-9602' has been assigned to this issue by Red Hat Inc. > > Thank you. > -- > Prasad J Pandit / Red Hat Product Security Team > 47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
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