Privilege escalation in QEMU



Published: 2021-01-26
Risk Medium
Patch available NO
Number of vulnerabilities 1
CVE ID CVE-2020-35517
CWE ID CWE-264
Exploitation vector Local network
Public exploit N/A
Vulnerable software
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QEMU
Client/Desktop applications / Virtualization software

Vendor QEMU

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Security restrictions bypass

Risk: Medium

CVSSv3.1: 7.7 [CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:U/RL:U/RC:C] [PCI]

CVE-ID: CVE-2020-35517

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists within the virtio-fs shared file system daemon (virtiofsd). A remote privileged user of the guest operating system can create device special file in the shared directory and use it to r/w access host devices.

Mitigation

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

Vulnerable software versions

QEMU: 5.0.0, 5.0.1, 5.1.0, 5.2.0

CPE External links

http://seclists.org/oss-sec/2021/q1/64
https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05461.html

Q & A

Can this vulnerability be exploited remotely?

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

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.



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