CVE-2023-4746: Detailed Vulnerability Analysis and Overview

CVE-2023-4746 Vulnerability Summary

A vulnerability classified as critical has been found in TOTOLINK N200RE V5 9.3.5u.6437_B20230519. This affects the function Validity_check. The manipulation leads to format string. It is possible to initiate the attack remotely. The root-cause of the vulnerability is a format string issue. But the impact is to bypass the validation which leads to to OS command injection. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-238635.

CVE-2023-4746: Detailed Information and External References

EPSS

0.00254

EPSS %

0.65634

References

0.00254

• https://gist.github.com/dmknght/8f3b6aa65e9d08f45b5236c6e9ab8d80
• https://vuldb.com/?ctiid.238635
• https://vuldb.com/?id.238635

CWE

CWE-134

CAPEC

0.00254

• Format String Injection: An adversary includes formatting characters in a string input field on the target application. Most applications assume that users will provide static text and may respond unpredictably to the presence of formatting character. For example, in certain functions of the C programming languages such as printf, the formatting character %s will print the contents of a memory location expecting this location to identify a string and the formatting character %n prints the number of DWORD written in the memory. An adversary can use this to read or write to memory locations or files, or simply to manipulate the value of the resulting text in unexpected ways. Reading or writing memory may result in program crashes and writing memory could result in the execution of arbitrary code if the adversary can write to the program stack.
• String Format Overflow in syslog(): This attack targets applications and software that uses the syslog() function insecurely. If an application does not explicitely use a format string parameter in a call to syslog(), user input can be placed in the format string parameter leading to a format string injection attack. Adversaries can then inject malicious format string commands into the function call leading to a buffer overflow. There are many reported software vulnerabilities with the root cause being a misuse of the syslog() function.

Vulnerable Configurations

• cpe:2.3:o:totolink:n200re-v5_firmware:9.3.5u.6437_b20230519:*:*:*:*:*:*:*
  cpe:2.3:o:totolink:n200re-v5_firmware:9.3.5u.6437_b20230519:*:*:*:*:*:*:*
• cpe:2.3:h:totolink:n200re-v5:-:*:*:*:*:*:*:*
  cpe:2.3:h:totolink:n200re-v5:-:*:*:*:*:*:*:*

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H