CVE-2021-20153 Path traversal in Trendnet AC2600 TEW-827DRU
Attackers can achieve remote code execution on Trendnet routers by exploiting a symlink vulnerability in the optional bittorrent feature via malicious USB drives.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-20153?
CVE-2021-20153 is a medium-severity path traversal vulnerability in Trendnet AC2600 TEW-827DRU, published on 30 Dec 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Trendnet AC2600 TEW-827DRU version 2.08B01 contains a symlink vulnerability in the bittorrent functionality. If enabled, the bittorrent functionality is vulnerable to a symlink attack that could lead to remote code execution on the device. If an end user inserts a flash drive with a malicious symlink on it that the bittorrent client can write downloads to, then a user is able to download arbitrary files to any desired location on the devices filesystem, which could lead to remote code execution. Example directories vulnerable to this include "config", "downloads", and "torrents", though it should be noted that "downloads" is the only vector that allows for arbitrary files to be downloaded to arbitrary locations.
Weakness: CWE-59
Which versions are affected by CVE-2021-20153?
It affects 1 product.
Products include Trendnet Tew-827dru Firmware.
How do I fix CVE-2021-20153?
No fix has been published for CVE-2021-20153 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2021-20153 being exploited?
There is no known exploitation of CVE-2021-20153 in the wild and no public exploit code.
Other vulnerabilities in Trendnet AC2600 TEW-827DRU
Sources
Also known as GHSA-xqh9-rp73-qqh5.