Privilege escalation in QEMU

1) Stack-based buffer overflow

EUVDB-ID: #VU87161

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-6693

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when flushing TX in the virtio_net_flush_tx() function if guest features VIRTIO_NET_F_HASH_REPORT, VIRTIO_F_VERSION_1 and VIRTIO_NET_F_MRG_RXBUF are enabled. A local user can trigger a stack based buffer overflow and execute arbitrary code on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

QEMU: All versions

External links

http://access.redhat.com/security/cve/CVE-2023-6693
http://bugzilla.redhat.com/show_bug.cgi?id=2254580
http://security.netapp.com/advisory/ntap-20240208-0004/
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OYGUN5HVOXESW7MSNM44E4AE2VNXQB6Y/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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