PT-2023-4734 · Totolink · Totolink N200Re V5

Dmknght · Published 2023-09-03 · Updated 2024-05-17 · CVE-2023-4746

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions TOTOLINK N200RE V5 version 9.3.5u.6437 B20230519

Description The issue is related to the Validity check() function in the TOTOLINK N200RE V5 router's firmware. It involves the use of uncontrolled format strings when processing the % symbol, which can lead to format string vulnerabilities. This can be exploited remotely, allowing an attacker to execute arbitrary commands. The root cause is a format string issue that enables OS command injection by bypassing validation.

Recommendations For TOTOLINK N200RE V5 version 9.3.5u.6437 B20230519, as a temporary workaround, consider disabling the Validity check() function until a patch is available. Restrict access to the vulnerable function to minimize the risk of exploitation. Avoid using the % symbol in the affected function until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Use of Externally-Controlled Format String

Weakness Enumeration

CWE-134

Related Identifiers

BDU:2023-05168

CVE-2023-4746

Affected Products

Totolink N200Re V5

References · 10

• 🔥 https://gist.github.com/dmknght/8f3b6aa65e9d08f45b5236c6e9ab8d80 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2023-4746 · Security Note
• https://osv.dev/vulnerability/CVE-2023-4746 · Vendor Advisory
• https://bdu.fstec.ru/vul/2023-05168 · Security Note
• https://t.me/cibsecurity/69735 · Telegram Post
• https://vuldb.com/?id.238635 · Note
• https://vuldb.com/ru/?id.238635 · Note
• https://twitter.com/vuldb/status/1698443005391421765 · Twitter Post
• https://vuldb.com/?ctiid.238635 · Note
• https://twitter.com/CVEnew/status/1698501649780613292 · Twitter Post