Remote code execution in QNAP devices running Samba

1) Integer overflow

EUVDB-ID: #VU69337

Risk: Medium

CVSSv4.0: 5.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-42898

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to an integer overflow within the S4U2Proxy handler on 32-bit systems. A remote user can send specially crafted request to the KDC server, trigger an integer overflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

QVP (QVR Pro appliances): All versions

QNAP QTS: before 5.0.1.2346 20230322

CPE2.3

• cpe:2.3:h:qnap_systems:qvp_qvr_pro_appliances:*:*:*:*:*:*:*:*
• cpe:2.3:a:qnap_systems:qnap_qts:*:*:*:*:*:*:*:*

External links

https://www.qnap.com/en/security-advisory/qsa-23-03

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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