CVE-2021-36711: OctoBot Octobot Mishandles Tentacles Upload Vulnerability

CRITICAL
Advisory Identifier: GHSA-fr75-x856-q6j8
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CVSS 9.8
CWE-434
Published
Advisory Summary

CVE-2021-36711 is a CRITICAL (CVSS 9.8) octobot mishandles tentacles upload vulnerability (CWE-434: Unrestricted Upload of File with Dangerous Type) affecting OctoBot libraries in the PyPI ecosystem. The issue involves octobot mishandles tentacles upload. Remediation is available by upgrading affected packages to version 0.4.4.

CVE-2021-36711 at a Glance

CVE Identifier CVE-2021-36711
GHSA Identifier GHSA-fr75-x856-q6j8
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-434: Unrestricted Upload of File with Dangerous Type
Affected Product OctoBot
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2021-36711

To remediate this vulnerability, upgrade all affected OctoBot dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

OctoBot fixed: 0.4.4 
pip install OctoBot>=0.4.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show OctoBot

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2021-36711, inspect your installed packages using pip:

pip show OctoBot

Analyze the terminal output to locate any version of OctoBot in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.4.4), your application is affected.

Note: The pip show OctoBot command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-434: Unrestricted Upload of File with Dangerous Type, where the product allows the upload or transfer of dangerous file types that are automatically processed within its environment. In OctoBot, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

WebInterface in OctoBot before 0.4.4 allows remote code execution because Tentacles upload is mishandled.

CVE-2021-36711 Affected OctoBot Versions

1 component(s)
Fixed Versions:
0.4.4
Product / Package Ecosystem Affected Versions Fixed Version
OctoBot
pypi/OctoBot
PyPI
< 0.4.4
0.4.4

References

NVD — CVE-2021-36711 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-36711
OctoBot Source Repository REPOSITORY
https://github.com/Drakkar-Software/OctoBot/issues/1966
OctoBot Source Repository REPOSITORY
https://github.com/Drakkar-Software/OctoBot
OctoBot Source Repository REPOSITORY
https://github.com/Drakkar-Software/OctoBot/blob/master/CHANGELOG.md
OctoBot Source Repository REPOSITORY
https://github.com/Drakkar-Software/OctoBot/blob/master/CHANGELOG.md#044---2022-06-01
OctoBot Source Repository REPOSITORY
https://github.com/Nwqda/Sashimi-Evil-OctoBot-Tentacle
GitHub Advisory / Wiki ADVISORY
https://github.com/advisories/GHSA-fr75-x856-q6j8
OctoBot Source Repository REPOSITORY
https://github.com/pypa/advisory-database/tree/main/vulns/octobot/PYSEC-2022-235.yaml
OctoBot Security Information SECURITY
https://packetstormsecurity.com/files/167721/Sashimi-Evil-OctoBot-Tentacle.html
OctoBot Security Information SECURITY
https://www.octobot.online
OctoBot Security Information SECURITY
http://packetstormsecurity.com/files/167780/OctoBot-WebInterface-0.4.3-Remote-Code-Execution.html

Frequently Asked Questions

What is CVE-2021-36711?
CVE-2021-36711 is a security vulnerability in OctoBot involving Octobot mishandles Tentacles upload under CWE-434: Unrestricted Upload of File with Dangerous Type.
Which OctoBot versions are affected?
Affected versions include releases prior to 0.4.4 across affected packages: OctoBot.
What version fixes CVE-2021-36711?
Upgrading to 0.4.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is OctoBot affected?
Yes, OctoBot is affected in releases prior to 0.4.4. Upgrade your dependency to 0.4.4 or later.
What is the CVSS score of CVE-2021-36711?
CVE-2021-36711 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2021-36711?
CVE-2021-36711 is classified under CWE-434: Unrestricted Upload of File with Dangerous Type (The product allows the upload or transfer of dangerous file types that are automatically processed within its environment.).
How can I check PyPI dependencies for CVE-2021-36711?
Run the dependency tree command: 'pip show OctoBot'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fr75-x856-q6j8",
  "modified" : "2024-10-07T16:45:28Z",
  "published" : "2022-07-17T00:00:44Z",
  "aliases" : [ "CVE-2021-36711" ],
  "summary" : "Octobot mishandles Tentacles upload",
  "details" : "WebInterface in OctoBot before 0.4.4 allows remote code execution because Tentacles upload is mishandled.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "OctoBot"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.4.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-36711"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Drakkar-Software/OctoBot/issues/1966"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/Drakkar-Software/OctoBot"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Drakkar-Software/OctoBot/blob/master/CHANGELOG.md"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Drakkar-Software/OctoBot/blob/master/CHANGELOG.md#044---2022-06-01"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/Nwqda/Sashimi-Evil-OctoBot-Tentacle"
  }, {
    "type" : "ADVISORY",
    "url" : "https://github.com/advisories/GHSA-fr75-x856-q6j8"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pypa/advisory-database/tree/main/vulns/octobot/PYSEC-2022-235.yaml"
  }, {
    "type" : "WEB",
    "url" : "https://packetstormsecurity.com/files/167721/Sashimi-Evil-OctoBot-Tentacle.html"
  }, {
    "type" : "WEB",
    "url" : "https://www.octobot.online"
  }, {
    "type" : "WEB",
    "url" : "http://packetstormsecurity.com/files/167780/OctoBot-WebInterface-0.4.3-Remote-Code-Execution.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-434" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2022-07-20T01:31:34Z",
    "nvd_published_at" : "2022-07-16T17:15:00Z"
  }
}