Date: Thu, 13 Dec 2018 22:48:11 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> cc: public@...smi.ch Subject: CVE-2018-16872 Qemu: usb-mtp: path traversal by host filesystem manipulation in Media Transfer Protocol (MTP) Hello, A flaw was found in qemu Media Transfer Protocol (MTP). The code opening files in usb_mtp_get_object and usb_mtp_get_partial_object and directories in usb_mtp_object_readdir doesn't consider that the underlying filesystem may have changed since the time lstat(2) was called in usb_mtp_object_alloc, a classical TOCTTOU problem. An attacker with write access to the host filesystem shared with a guest can use this property to navigate the host filesystem in the context of the QEMU process and read any file the QEMU process has access to. Access to the filesystem may be local or via a network share protocol such as CIFS. Upstream patch: --------------- -> https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg03135.html This issue was reported by Michael Hanselmann. Thank you. -- Prasad J Pandit / Red Hat Product Security Team 47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
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