#VU27544 Buffer overflow in QEMU - CVE-2020-11102

Vulnerability identifier: #VU27544

Vulnerability risk: High

CVSSv4.0: 7.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2020-11102

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
QEMU
Client/Desktop applications / Virtualization software

Vendor: QEMU

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary within hw/net/tulip.c in QEMU during the copying of tx/rx buffers because the frame size is not validated against the r/w data length. A remote attacker can  trigger memory corruption and execute arbitrary code on the target system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

QEMU: 4.2.0

---

External links
https://www.openwall.com/lists/oss-security/2020/04/06/1
https://lists.gnu.org/archive/html/qemu-devel/2020-03/msg08322.html

---

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.