CVE-2016-3114 in Kallithea
Summary
by MITRE
Kallithea before 0.3.2 allows remote authenticated users to edit or delete open pull requests or delete comments by leveraging read access.
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Analysis
by VulDB Data Team • 09/20/2020
The vulnerability described in CVE-2016-3114 affects Kallithea versions prior to 0.3.2 and represents a significant authorization flaw that undermines the integrity of collaborative code review processes. This issue stems from insufficient access control mechanisms within the application's permission model, specifically impacting the management of pull requests and comments within version control workflows. The vulnerability exists in the application's handling of user permissions, where authenticated users with read-only access can manipulate critical collaborative elements that should be restricted to authorized maintainers or administrators.
The technical flaw manifests in how Kallithea processes requests for modifying or removing pull request data and comment structures. When authenticated users with read access attempt to edit or delete open pull requests, or when they try to remove comments from pull requests, the system fails to properly validate whether the user possesses the necessary write permissions for these operations. This misconfiguration allows attackers to exploit the system through carefully crafted API calls or web interface interactions that bypass intended authorization checks. The vulnerability is particularly concerning because it operates at the application level rather than relying on network-level attacks, making it more difficult to detect through traditional network monitoring approaches.
The operational impact of this vulnerability extends beyond simple data manipulation, as it fundamentally compromises the collaborative integrity of software development workflows within Kallithea. Attackers can potentially disrupt ongoing development processes by deleting critical pull requests that contain important code changes, or by removing comments that document important discussions and decisions made during code review. This capability can lead to loss of development history, confusion among team members, and potential security implications if malicious actors use this vulnerability to remove evidence of security issues or malicious code that was flagged during review processes. The vulnerability also undermines trust in the code review system's ability to maintain accurate records of collaborative development activities.
Organizations using Kallithea versions prior to 0.3.2 should prioritize immediate remediation through the application of the official patch released with version 0.3.2, which addresses the underlying authorization logic. Additional mitigations include implementing network-level controls such as firewall rules to restrict access to the application's API endpoints, monitoring for unusual patterns in pull request modifications or comment deletions, and conducting regular audits of user permissions to ensure proper access controls are in place. Security teams should also consider implementing application-level logging that tracks all modification attempts to pull requests and comments, as this can help detect exploitation attempts before they cause significant damage to development workflows.
This vulnerability aligns with CWE-285, which describes improper authorization issues in software systems, and demonstrates how insufficient access control can lead to privilege escalation within collaborative development platforms. The attack pattern follows ATT&CK technique T1078 for valid accounts, where attackers leverage legitimate user credentials to perform unauthorized actions within the application. Organizations should also consider the broader implications of this vulnerability in relation to DevOps security practices and the importance of implementing proper access controls for all collaborative development tools to prevent similar issues in other platforms within their software development lifecycle ecosystems.