Vulnerability Details : 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 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.
Vulnerability category: Directory traversalExecute code
Products affected by CVE-2021-20134
- cpe:2.3:o:dlink:dir-2640-us_firmware:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-20134
0.08%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 35 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-20134
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.4
|
HIGH | AV:A/AC:M/Au:S/C:C/I:C/A:C |
4.4
|
10.0
|
NIST | |
|
8.4
|
HIGH | CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
1.7
|
6.0
|
NIST |
CWE ids for CVE-2021-20134
-
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-20134
-
https://www.tenable.com/security/research/tra-2021-44
Critical Vulnerabilities on the D-Link DIR-2640 Router - Research Advisory | Tenable®Exploit;Third Party Advisory
Jump to