#VU33813 Input validation error in QEMU - CVE-2015-4037

Vulnerability identifier: #VU33813

Vulnerability risk: Low

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2015-4037

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The slirp_smb function in net/slirp.c in QEMU 2.3.0 and earlier creates temporary files with predictable names, which allows local users to cause a denial of service (instantiation failure) by creating /tmp/qemu-smb.*-* files before the program.

Mitigation
Install update from vendor's website.

Vulnerable software versions

QEMU: 2.0 - 2.3.0

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External links
https://lists.fedoraproject.org/pipermail/package-announce/2015-June/160058.html
https://lists.fedoraproject.org/pipermail/package-announce/2015-June/160414.html
https://lists.opensuse.org/opensuse-security-announce/2015-06/msg00027.html
https://lists.opensuse.org/opensuse-security-announce/2015-09/msg00015.html
https://lists.opensuse.org/opensuse-updates/2015-11/msg00063.html
https://www.debian.org/security/2015/dsa-3284
https://www.debian.org/security/2015/dsa-3285
https://www.openwall.com/lists/oss-security/2015/05/13/7
https://www.openwall.com/lists/oss-security/2015/05/16/5
https://www.openwall.com/lists/oss-security/2015/05/23/4
https://www.securityfocus.com/bid/74809
https://www.securitytracker.com/id/1032547
https://www.ubuntu.com/usn/USN-2630-1
https://bugzilla.redhat.com/show_bug.cgi?id=1222892

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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 Internet.

Is there known malware, which exploits this vulnerability?

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