Improper Authentication in QEMU

1) Improper Authentication

EUVDB-ID: #VU43973

Risk: Medium

CVSSv3.1: 4.4 [CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-0011

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

qemu-kvm before 0.11.0 disables VNC authentication when the password is cleared, which allows remote attackers to bypass authentication and establish VNC sessions.

Mitigation

Install update from vendor's website.

Vulnerable software versions

QEMU: 0.1 - 0.11.0

CPE2.3

• cpe:2.3:a:qemu:qemu:0.1:*:*:*:*:*:*:
• cpe:2.3:a:qemu:qemu:0.1.1:*:*:*:*:*:*:
• cpe:2.3:a:qemu:qemu:0.1.2:*:*:*:*:*:*:

External links

http://rhn.redhat.com/errata/RHSA-2011-0345.html
http://secunia.com/advisories/42830
http://secunia.com/advisories/43272
http://secunia.com/advisories/43733
http://secunia.com/advisories/44393
http://ubuntu.com/usn/usn-1063-1
http://www.openwall.com/lists/oss-security/2011/01/10/3
http://www.openwall.com/lists/oss-security/2011/01/11/1
http://www.openwall.com/lists/oss-security/2011/01/12/2
http://www.osvdb.org/70992
http://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/697197
http://exchange.xforce.ibmcloud.com/vulnerabilities/65215

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).

How the attacker can exploit this vulnerability?

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

Is there known malware, which exploits this vulnerability?

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