Multiple vulnerabilities in QEMU

Published: 2017-09-06 | Updated: 2018-08-07

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2017-7539 CVE-2017-15118
CWE-ID	CWE-20 CWE-121
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software	Other QEMU Client/Desktop applications / Virtualization software
Vendor	QEMU

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Denial of service

EUVDB-ID: #VU8113

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 - Improper input validation

Exploit availability: No

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

CPE2.3

External links

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

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.

2) Stack-based buffer overflow

EUVDB-ID: #VU14217

Risk: High

CVSSv4.0: 8.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber]

CVE-ID: CVE-2017-15118

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists in the network block device (NBD) server implementation due to stack-based buffer overflow when handling malicious input. A remote unauthenticated attacker can send a large export-name request, trigger memory corruption and cause the service to crash or execute arbitrary code with elevated privileges.

Mitigation

Update to version 2.11 or later.