CVE-2022-20619 in Bitbucket Branch Source Plugin
Summary
by MITRE • 01/12/2022
A cross-site request forgery (CSRF) vulnerability in Jenkins Bitbucket Branch Source Plugin 737.vdf9dc06105be and earlier allows attackers to connect to an attacker-specified URL using attacker-specified credentials IDs obtained through another method, capturing credentials stored in Jenkins.
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Analysis
by VulDB Data Team • 01/15/2022
The CVE-2022-20619 vulnerability represents a critical cross-site request forgery flaw within the Jenkins Bitbucket Branch Source Plugin, specifically affecting versions up to and including 737.vdf9dc06105be. This vulnerability operates by exploiting the plugin's insufficient validation of HTTP requests, allowing malicious actors to manipulate the authentication flow and potentially compromise stored credentials within the Jenkins environment. The flaw fundamentally undermines the security boundaries that should protect sensitive credential storage mechanisms.
The technical implementation of this CSRF vulnerability stems from the plugin's failure to properly verify the origin of requests when processing Bitbucket repository connections. Attackers can craft malicious web pages or scripts that, when executed in a victim's browser context, trigger unauthorized requests to the Jenkins instance. These requests leverage legitimate session cookies and authentication tokens, making them appear as if they originate from authorized users. The vulnerability specifically targets the plugin's credential handling mechanism, enabling attackers to connect to arbitrary URLs using credentials IDs that they have previously obtained through alternative exploitation techniques.
The operational impact of this vulnerability extends beyond simple credential theft, as it provides attackers with persistent access to Bitbucket repositories and associated Jenkins operations. Once exploited, attackers can perform unauthorized actions including repository cloning, code modifications, and access to sensitive build artifacts. The vulnerability's potential for credential harvesting creates a significant risk for organizations relying on Jenkins for continuous integration and deployment workflows, particularly those with extensive Bitbucket integration. This weakness can be leveraged as a stepping stone for further attacks within the CI/CD pipeline, potentially leading to supply chain compromises and broader system infiltration.
Organizations should immediately upgrade to the patched version of the Bitbucket Branch Source Plugin to mitigate this vulnerability, as the flaw does not require authentication to exploit. Security teams should also implement additional monitoring for suspicious API requests and credential usage patterns within their Jenkins environments. The vulnerability aligns with CWE-352, which specifically addresses cross-site request forgery weaknesses, and maps to ATT&CK technique T1566.002 for the exploitation of web applications. Mitigation strategies should include enabling Jenkins' built-in CSRF protection mechanisms, implementing proper request origin validation, and conducting regular security audits of CI/CD plugin configurations. Additionally, organizations should consider network segmentation and privilege separation to limit the potential damage from credential compromise.