#VU31804 NULL pointer dereference in QEMU - CVE-2020-13659

Vulnerability identifier: #VU31804

Vulnerability risk: Medium

CVSSv4.0: 4.6 [CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-13659

CWE-ID: CWE-476

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in exec.c, related to BounceBuffer. A local user on the guest operating system can perform a denial of service (DoS) attack against the host system.

Mitigation
Cybersecurity Help is currently unaware of any official solution to address this vulnerability..

Vulnerable software versions

QEMU: 4.1.0 - 5.0.0

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External links
https://www.openwall.com/lists/oss-security/2020/06/01/3
https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg07313.html
https://security.netapp.com/advisory/ntap-20200608-0007/
https://www.debian.org/security/2020/dsa-4728

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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