Infinite loop in QEMU

1) Infinite loop

EUVDB-ID: #VU33055

Risk: Low

CVSSv3.1: 5.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-6505

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Exploit availability: No

Description

The vulnerability allows a local authenticated user to a crash the entire system.

The ohci_service_ed_list function in hw/usb/hcd-ohci.c in QEMU (aka Quick Emulator) before 2.9.0 allows local guest OS users to cause a denial of service (infinite loop) via vectors involving the number of link endpoint list descriptors, a different vulnerability than CVE-2017-9330.

Mitigation

Install update from vendor's website.

Vulnerable software versions

QEMU: 2.0 - 2.8.1.1

External links

http://git.qemu-project.org/?p=qemu.git;a=commitdiff;h=95ed56939eb2eaa4e2f349fe6dcd13ca4edfd8fb
http://www.openwall.com/lists/oss-security/2017/03/06/6
http://www.securityfocus.com/bid/96611
http://bugzilla.redhat.com/show_bug.cgi?id=1429432
http://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
http://security.gentoo.org/glsa/201704-01

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.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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