Denial of service in QEMU

1) Out-of-bounds read

EUVDB-ID: #VU28283

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/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-2020-13253

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

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

The vulnerability exists due to a boundary condition in the SD Memory Card emulator while performing block write commands via sdhci_write() in QEMU. A remote user of guest operating system can trigger out-of-bounds read error and crash the QEMU process. 

Mitigation

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

Vulnerable software versions

QEMU: 4.0.0 - 5.0.0

CPE2.3

• cpe:2.3:a:qemu:qemu:4.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:qemu:qemu:4.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:qemu:qemu:4.1.0:*:*:*:*:*:*:*

External links

https://seclists.org/oss-sec/2020/q2/146
https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg05877.html
https://bugs.launchpad.net/qemu/+bug/1880822

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user 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.