Vulnerability identifier: #VU18302

Vulnerability 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-2019-6778

CWE-ID: CWE-122

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a local user to perform denial of service (DoS) attack.

The vulnerability exists due to a boundary error within the tcp_emu() function in slirp/tcp_subr.c. A local user can send specially crafted networking packets, trigger heap-based buffer overflow and crash the affected system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

QEMU: 3.0.0

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External links
http://lists.opensuse.org/opensuse-security-announce/2019-02/msg00073.html
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00042.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00072.html
http://www.openwall.com/lists/oss-security/2019/01/24/5
http://www.securityfocus.com/bid/106758
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KJMTVGDLA654HNCDGLCUEIP36SNJEKK7/
http://lists.gnu.org/archive/html/qemu-devel/2019-01/msg03132.html
http://usn.ubuntu.com/3923-1/

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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.

Is there known malware, which exploits this vulnerability?

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