Multiple vulnerabilities in QEMU

1) Memory leak

EUVDB-ID: #VU53679

Risk: Medium

CVSSv3.1: 6 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3544

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote user to perform DoS attack on the target system.

The vulnerability exists due to multiple memory leaks in the vhost-user-gpu/vhost-user-gpu.c. A remote authenticated user of the guest operating system can force the application to leak memory and perform denial of service attack.

Mitigation

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

Vulnerable software versions

QEMU: 5.0.0 - 6.0.0

External links

http://seclists.org/oss-sec/2021/q2/176
http://gitlab.com/qemu-project/qemu/-/commit/86dd8fac
http://gitlab.com/qemu-project/qemu/-/commit/b9f79858
http://gitlab.com/qemu-project/qemu/-/commit/b7afebcf
http://gitlab.com/qemu-project/qemu/-/commit/f6091d86
http://gitlab.com/qemu-project/qemu/-/commit/63736af5

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.

2) Information disclosure

EUVDB-ID: #VU53680

Risk: Low

CVSSv3.1: 4 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3545

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to potentially sensitive information.

The vulnerability exists due to uninitialized memory disclosure within the virgl_cmd_get_capset_info() function in vhost-user-gpu/virgl.c. A remote authenticated user of the guest operating system can gain unauthorized access to sensitive information on the system.

Mitigation

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

Vulnerable software versions

QEMU: 4.1.0 - 6.0.0

External links

http://seclists.org/oss-sec/2021/q2/176
http://gitlab.com/qemu-project/qemu/-/commit/121841b2

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.

3) Out-of-bounds write

EUVDB-ID: #VU53681

Risk: Medium

CVSSv3.1: 8.1 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:U/RC:C]

CVE-ID: CVE-2021-3546

CWE-ID: CWE-787 - Out-of-bounds write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing untrusted input within the virgl_cmd_get_capset() function in vhost-user-gpu/virgl.c. A remote authenticated user of the guest operating system can trigger an out-of-bounds write and escalate privileges.

Mitigation

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

Vulnerable software versions

QEMU: 4.1.0 - 6.0.0

External links

http://seclists.org/oss-sec/2021/q2/176
http://gitlab.com/qemu-project/qemu/-/commit/9f22893a

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.