#VU32085 Memory leak in QEMU - CVE-2017-5857

Vulnerability identifier: #VU32085

Vulnerability risk: Medium

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2017-5857

CWE-ID: CWE-401

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the virgl_cmd_resource_unref function in hw/display/virtio-gpu-3d.c in QEMU (aka Quick Emulator) allows local guest OS users to cause a denial of service (host memory consumption) via a large number of VIRTIO_GPU_CMD_RESOURCE_UNREF commands sent without detaching the backing storage beforehand. A remote attacker can perform a denial of service attack.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

QEMU: 3.1.3

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External links
https://git.qemu-project.org/?p=qemu.git;a=commit;h=5e8e3c4c75c199aa1017db816fca02be2a9f8798
https://www.openwall.com/lists/oss-security/2017/02/01/21
https://www.openwall.com/lists/oss-security/2017/02/02/16
https://www.securityfocus.com/bid/95993
https://bugzilla.redhat.com/show_bug.cgi?id=1418382
https://security.gentoo.org/glsa/201702-28

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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