CVE-2019-11580: Proof-of-Concept for Critical Atlassian Crowd Remote Code Execution Vulnerability Now Available
A proof-of-concept for critical Atlassian Crowd vulnerability patched on May 22 is now available.
Background
On July 14, security researcher Corben Leo published a blog detailing the analysis of a recently patched vulnerability in Atlassian Crowd, a user management application for access control for Active Directory (AD), Lightweight Directory Access Protocol (LDAP), OpenLDAP and Microsoft Azure AD.
분석
On May 22, Atlassian published Crowd Security Advisory 2019-05-22 to address CVE-2019-11580. According to the advisory, Crowd and Crowd Data Center incorrectly enabled a development plugin for pdkinstall in release builds. A remote attacker could exploit this flaw to install arbitrary plugins by sending unauthenticated or authenticated requests to vulnerable Crowd or Crowd Data Center instances, which could grant them the ability to execute code.
Leo’s blog post provides analysis of the pdkinstall plugin and the PdkInstallFilter servlet, which he used to craft a proof-of-concept (PoC) that allowed him to gain pre-authenticated remote code execution in Atlassian Crowd.
Image credit: Corben Leo
Proof of concept
Leo published a malicious plugin on GitHub to be used as part of a PoC included in his blog post:
curl -k -H "Content-Type: multipart/mixed" \ --form "[email protected]" http://localhost:4990/crowd/admin/uploadplugin.action
Solution
Atlassian published patched versions of Crowd and Crowd Data Center on May 22. The patched versions include 3.0.5, 3.1.6, 3.2.8, 3.3.5, and 3.4.4. The following table lists the vulnerable versions and the associated fixed versions.
|
Affected Versions |
Fixed Version |
|
2.1.0, 2.1.1, 2.1.2, 2.2.0, 2.2.1, 2.2.2, 2.2.3, 2.2.4, 2.2.5, 2.2.6, 2.2.7, 2.2.8, 2.2.9, 2.3.0, 2.3.1, 2.3.2, 2.3.3, 2.3.4, 2.3.5, 2.3.6, 2.3.7, 2.3.8, 2.3.9, 2.3.10, 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, 2.4.7, 2.4.8, 2.4.9, 2.4.10, 2.4.11, 2.5.0, 2.5.1, 2.5.2, 2.5.3, 2.5.4, 2.5.5, 2.5.6, 2.5.7, 2.6.0, 2.6.1, 2.6.2, 2.6.3, 2.6.4, 2.6.5, 2.6.6, 2.6.7, 2.7.0, 2.7.1, 2.7.2, 2.8.0, 2.8.1, 2.8.2, 2.8.3, 2.8.4, 2.8.6, 2.8.7, 2.8.8, 2.9.1, 2.9.2, 2.9.3, 2.9.4, 2.9.5, 2.9.6, 2.9.7, 2.10.1, 2.10.2, 2.10.3, 2.10.4, 2.11.0, 2.11.1, 2.11.2, 2.12.0, 2.12.1, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4 |
|
|
3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.5 |
|
|
3.2.0, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.6, 3.2.7 |
|
|
3.3.0, 3.3.1, 3.3.2, 3.3.3, 3.3.4 |
|
|
3.4.0, 3.4.1, 3.4.2, 3.4.3 |
If upgrading to a patched version of Atlassian Crowd is not feasible at this time, Atlassian provided mitigation steps in their Security Advisory to address the vulnerability as well as a bash script to automate the mitigation steps on Linux systems.
Identifying affected systems
A list of Tenable plugins to identify this vulnerability can be found here.
Get more information
Join Tenable's Security Response Team on the Tenable Community.
Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface. Get a free 60-day trial of Tenable.io Vulnerability Management.
관련 기사
Securing Financial Data in the Cloud: How Tenable Can Help
November 4, 2024Preventing data loss, complying with regulations, automating workflows and managing access are four key challenges facing financial institutions. Learn how Tenable can help.
Cybersecurity Snapshot: Apply Zero Trust to Critical Infrastructure’s OT/ICS, CSA Advises, as Five Eyes Spotlight Tech Startups’ Security
November 1, 2024Should critical infrastructure orgs boost OT/ICS systems’ security with zero trust? Absolutely, the CSA says. Meanwhile, the Five Eyes countries offer cyber advice to tech startups. Plus, a survey finds “shadow AI” weakening data governance. And get the latest on MFA methods, CISO trends and Uncle Sam’s AI strategy.
FY 2024 State and Local Cybersecurity Grant Program Adds CISA KEV as a Performance Measure
October 31, 2024The CISA Known Exploited Vulnerabilities (KEV) catalog and enhanced logging guidelines are among the new measurement tools added for the 2024 State and Local Cybersecurity Grant Program.