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Vulnerability DatabaseCVE-2021-26557

CVE-2021-26557: 
Octopus Deploy Tentacle (Agent) vulnerability analysis and mitigation

Overview

When Octopus Tentacle is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access. This vulnerability, identified as CVE-2021-26557, affects Octopus Tentacle versions from 3.15.4 up to (excluding) 6.0.489 (NVD).

Technical details

The vulnerability has been assigned a CVSS v3.1 Base Score of 7.8 (HIGH) with the vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The vulnerability is classified under CWE-426 (Untrusted Search Path) and requires local access with user interaction for exploitation (NVD).

Impact

If successfully exploited, this vulnerability could allow an unprivileged user to gain elevated privileges through DLL side-loading, potentially leading to complete system compromise with high impacts on confidentiality, integrity, and availability (NVD).

Mitigation and workarounds

Users should upgrade their Octopus Tentacle installations to version 6.0.489 or later to address this vulnerability. The fix ensures proper ACL settings when installing Tentacle in custom folder locations (NVD).

Additional resources

Source: This report was generated using AI

Related Octopus Deploy Tentacle (Agent) vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2021-31822HIGH7.8
  • Octopus Deploy Tentacle (Agent)Octopus Deploy Tentacle (Agent)
  • cpe:2.3:a:octopus:tentacle
NoYesNov 24, 2021
CVE-2021-26557HIGH7.8
  • Octopus Deploy Tentacle (Agent)Octopus Deploy Tentacle (Agent)
  • cpe:2.3:a:octopus:tentacle
NoYesOct 07, 2021
CVE-2019-15508MEDIUM6.5
  • Octopus DeployOctopus Deploy
  • cpe:2.3:a:octopus:server
NoYesAug 23, 2019
CVE-2021-31821MEDIUM5.5
  • Octopus Deploy Tentacle (Agent)Octopus Deploy Tentacle (Agent)
  • cpe:2.3:a:octopus:tentacle
NoYesJan 19, 2022

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