#VU55914 Buffer overflow


Published: 2021-08-17 | Updated: 2021-08-25

Vulnerability identifier: #VU55914

Vulnerability risk: Critical

CVSSv3.1: 9.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2021-35395

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Realtek SDK
Universal components / Libraries / Software for developers
Realtek Jungle SDK
Universal components / Libraries / Software for developers
Realtek Luna SDK
Universal components / Libraries / Software for developers

Vendor: Realtek

Description

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

The vulnerability exists due to a boundary error in multiple parameters. A remote attacker can trigger memory corruption and execute arbitrary code on the target system.

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

This vulnerability affects the following parameters:

  • "submit-url" parameter in formRebootCheck/formWsc/formWlanMultipleAP
  • "ifname" parameter in formWlSiteSurvey
  • "hostname" parameter in formStaticDHCP
  • "peerPin" parameter in formWsc

Note, as of August 19 the vulnerability is being exploited in-the-wild by the Mirai botnet.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Realtek SDK: 2.0

Realtek Jungle SDK: 3.0 - 3.4T-CT

Realtek Luna SDK: 1.3.2


External links
http://www.realtek.com/en/cu-1-en/cu-1-taiwan-en
http://www.iot-inspector.com/blog/advisory-multiple-issues-realtek-sdk-iot-supply-chain
http://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf


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?

Yes. This vulnerability is being exploited in the wild.


Latest bulletins with this vulnerability