Vulnerability Details : CVE-2021-41127
Rasa is an open source machine learning framework to automate text-and voice-based conversations. In affected versions a vulnerability exists in the functionality that loads a trained model `tar.gz` file which allows a malicious actor to craft a `model.tar.gz` file which can overwrite or replace bot files in the bot directory. The vulnerability is fixed in Rasa 2.8.10. For users unable to update ensure that users do not upload untrusted model files, and restrict CLI or API endpoint access where a malicious actor could target a deployed Rasa instance.
Vulnerability category: Directory traversal
Products affected by CVE-2021-41127
- cpe:2.3:a:rasa:rasa:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-41127
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 25 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-41127
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:P |
8.6
|
4.9
|
NIST | |
|
7.1
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H |
1.8
|
5.2
|
NIST | |
|
7.3
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:H |
2.1
|
5.2
|
GitHub, Inc. |
CWE ids for CVE-2021-41127
-
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: security-advisories@github.com (Primary)
-
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.Assigned by: security-advisories@github.com (Primary)
References for CVE-2021-41127
-
https://github.com/RasaHQ/rasa/security/advisories/GHSA-4365-fhm5-qcrx
Maliciously Crafted Model Archive Can Lead To Arbitrary File Write · Advisory · RasaHQ/rasa · GitHubThird Party Advisory
-
https://github.com/RasaHQ/rasa/commit/1b6b502f52d73b4f8cd1959ce724b8ad0eb33989
Swap calls to extractall for TarSafe equivalent · RasaHQ/rasa@1b6b502 · GitHubPatch;Third Party Advisory
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