Permissions, Privileges, and Access Controls in QEMU

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU43971

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-2527

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

The change_process_uid function in os-posix.c in Qemu 0.14.0 and earlier does not properly drop group privileges when the -runas option is used, which allows local guest users to access restricted files on the host.

Mitigation

Install update from vendor's website.

Vulnerable software versions

QEMU: 0.1 - 0.15.0

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://lists.fedoraproject.org/pipermail/package-announce/2012-June/081972.html
http://lists.opensuse.org/opensuse-updates/2012-02/msg00009.html
http://rhn.redhat.com/errata/RHSA-2011-1531.html
http://secunia.com/advisories/45187
http://secunia.com/advisories/45188
http://secunia.com/advisories/45419
http://secunia.com/advisories/47157
http://secunia.com/advisories/47992
http://ubuntu.com/usn/usn-1177-1
http://www.openwall.com/lists/oss-security/2011/07/12/15
http://www.openwall.com/lists/oss-security/2011/07/12/5
http://www.osvdb.org/74752
http://www.securityfocus.com/bid/48659
http://bugs.launchpad.net/qemu/+bug/807893
http://exchange.xforce.ibmcloud.com/vulnerabilities/68539
http://www.debian.org/security/2011/dsa-2282

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

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.