CVE-2019-17147: tp-link tl-wr841n_firmware Classic Buffer Overflow

Vulnerability summary

CVE-2019-17147 is a high (CVSS 9.3) Classic Buffer Overflow vulnerability in tp-link tl-wr841n_firmware. EPSS estimates a 13.65% chance of exploitation in the next 30 days, higher than 96.4% of scored vulnerabilities.

Timeline

1. 07-01-2020
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

Description

This vulnerability allows remote attackers to execute arbitrary code on affected installations of TP-LINK TL-WR841N routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the web service, which listens on TCP port 80 by default. When parsing the Host request header, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length static buffer. An attacker can leverage this vulnerability to execute code in the context of the admin user. Was ZDI-CAN-8457.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.