#VU8113 Denial of service in QEMU - CVE-2017-7539

Vulnerability identifier: #VU8113

Vulnerability risk: Low

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/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-2017-7539

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor:
QEMU

Description
The vulnerability allows a remote attacker to cause DoS condition on a targeted system.

The weakness exists due to an assertion failure when handling malicious input. A remote attacker can submit a specially crafted data during initial connection negotiation and cause the qemu-nbd server to stop functioning.

Successful exploitation of the vulnerability results in denial of service.

Mitigation
Install update from vendor's website.
https://git.qemu.org/?p=qemu.git;a=patch;h=2b0bbc4f8809c972bad134bc1a2570dbb01dea0b

Vulnerable software versions

QEMU: 2.7.0 - 2.9.0

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External links
https://git.qemu.org/?p=qemu.git;a=commit;h=ff82911cd3f69f028f2537825c9720ff78bc3f19

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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 Internet.

Is there known malware, which exploits this vulnerability?

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