Executive Summary

Title Atlassian Bitbucket on Windows is vulnerable to privilege escalation due to weak ACLs
Name VU#240785 First vendor Publication 2021-02-18
Vendor VU-CERT Last vendor Modification 2021-02-18
Severity (Vendor) N/A Revision M

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Overall CVSS Score 7.8
Base Score 7.8 Environmental Score 7.8
impact SubScore 5.9 Temporal Score 7.8
Exploitabality Sub Score 1.8
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Unchanged Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:P/I:P/A:P)
Cvss Base Score 4.6 Attack Range Local
Cvss Impact Score 6.4 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores



Atlassian Bitbucket on Windows fails to properly set ACLs, which can allow an unprivileged Windows user to run arbitrary code with SYSTEM privileges.


The Atlassian Bitbucket Windows installer fails to set a secure access-control list (ACL) on the default installation directory, such as C:\Atlassian\Bitbucket\. By default, unprivileged users can create files in this directory structure, which creates a privilege-escalation vulnerability.


By placing a specially-crafted DLL file in the Bitbucket installation directory, an unprivileged user may be able to execute arbitrary code with SYSTEM privileges on a Windows system with the vulnerable Bitbucket software installed. See DLL Search Order Hijacking for more details.


Apply an update

This issue has been addressed in the Bitbucket Windows installer for versions 7.10.1, 7.6.4, and 6.10.9. Please see https://jira.atlassian.com/browse/BSERV-12753 for more details.


This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

Original Source

Url : https://kb.cert.org/vuls/id/240785

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-276 Incorrect Default Permissions

CPE : Common Platform Enumeration

Application 318

Alert History

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Date Informations
2021-03-26 12:45:43
  • Multiple Updates
2021-02-18 21:17:59
  • First insertion