#VU16061 Race condition in QEMU - CVE-2018-19489

Vulnerability identifier: #VU16061

Vulnerability risk: Low

CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-19489

CWE-ID: CWE-362

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows an adjacent attacker to cause DoS condition on the target system.

The vulnerability exists due to race condition while renaming files on a shared host directory. An adjacent attacker can use-after-free flaw in the VirtFS, host directory sharing via Plan 9 File System(9pfs) support and cause the service to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

QEMU: All versions

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External links
https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg04489.html
https://bugzilla.redhat.com/show_bug.cgi?id=1653156

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.