CVE-2017-7471

Description

Quick Emulator (Qemu) built with the VirtFS, host directory sharing via Plan 9 File System (9pfs) support, is vulnerable to an improper access control issue. It could occur while accessing 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.

CVSS Metrics

• v3.1•CRITICAL•Score: 9CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
• v2.0•HIGH•Score: 7.7AV:A/AC:L/Au:S/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 0.57%• Percentile: 69%

Techniques & Countermeasures

• CWE-732•Incorrect Permission Assignment for Critical Resource

  The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.

Affected Systems

• qemu•qemu

  ≤ 2.8.1.1 | 2.9.0:rc0 | 2.9.0:rc1 | 2.9.0:rc2 | 2.9.0:rc3 | 2.9.0:rc4

References (5)

• https://git.qemu.org/?p=qemu.git%3Ba=commitdiff%3Bh=9c6b899f7a46893ab3b671e341a2234e9c0c060e
• https://security.gentoo.org/glsa/201706-03
• http://www.securityfocus.com/bid/97970
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7471
• http://www.openwall.com/lists/oss-security/2017/04/19/2