#VU11134 Out-of-bounds read in QEMU - CVE-2018-7858

Vulnerability identifier: #VU11134

Vulnerability risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-7858

CWE-ID: CWE-125

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 weakness exists due to improper VGA display updates. An adjacent attacker can use incorrect region calculations during VGA display updates, trigger out-of-bounds read and cause the service to crash.

Mitigation
Install update from vendor's website.

Vulnerable software versions

QEMU: 1.1 - 2.9.3

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External links
https://www.openwall.com/lists/oss-security/2018/03/09/1

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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.