CVE-2021-20134
Quagga Services on D-Link DIR-2640 less than or equal to version 1.11B02 are affected by an absolute path traversal vulnerability that allows a remote, authenticated attacker to set an arbitrary file on the router's filesystem as the log file used by…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (7.53%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Quagga Services on D-Link DIR-2640 less than or equal to version 1.11B02 are affected by an absolute path traversal vulnerability that allows a remote, authenticated attacker to set an arbitrary file on the router's filesystem as the log file used by either Quagga service (zebra or ripd). Subsequent log messages will be appended to the file, prefixed by a timestamp and some logging metadata. Remote code execution can be achieved by using this vulnerability to append to a shell script on the router's filesystem, and then awaiting or triggering the execution of that script. A remote, unauthenticated root shell can easily be obtained on the device in this fashion.
- CVSS 3.1
- 8.4 HIGHCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 7.53% probability · 94th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- dlink/dir-2640-us firmware
- Source
- vulnreport@tenable.com
References
- https://www.tenable.com/security/research/tra-2021-44Exploit, Third Party Advisory
- https://www.tenable.com/security/research/tra-2021-44Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.