CVE-2005-1712 in Serendipity
Summary
by MITRE
Unknown vulnerability in Serendipity 0.8, when used with multiple authors, allows unprivileged authors to upload arbitrary media files.
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Analysis
by VulDB Data Team • 06/01/2019
The vulnerability identified as CVE-2005-1712 represents a critical access control flaw within the Serendipity blogging platform version 0.8, specifically affecting installations that support multiple author accounts. This issue manifests when the system fails to properly validate file upload permissions for users who do not possess administrative privileges, creating a significant security gap that undermines the platform's authorization mechanisms. The vulnerability is particularly concerning in multi-user environments where content creators with limited permissions can exploit this weakness to gain unauthorized access to system resources through media file uploads.
The technical implementation of this flaw stems from insufficient input validation and privilege checking during the file upload process within Serendipity's media handling subsystem. When multiple authors are configured within the platform, the system should enforce strict access controls that prevent lower-privilege users from uploading files to directories or locations that require administrative permissions. However, the vulnerability allows unprivileged authors to bypass these checks and execute arbitrary file uploads, potentially leading to remote code execution or other malicious activities depending on the server configuration and file types permitted for upload.
The operational impact of this vulnerability extends beyond simple unauthorized file uploads, as it creates potential attack vectors for more sophisticated exploitation techniques. An attacker with access to a low-privilege author account could upload malicious files such as php scripts, shell scripts, or other executable content that could then be executed on the server. This scenario aligns with attack patterns documented in the attack technique matrix under technique T1195 for content injection and T1059 for command and scripting interpreter usage. The vulnerability essentially provides a path for privilege escalation and persistent access to the compromised system.
This flaw directly maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, and CWE-73, which covers improper control of generation of code. The vulnerability enables unauthorized file system access through the media upload functionality, creating a pathway for attackers to place malicious code within the web root or other critical directories. Organizations using Serendipity 0.8 with multiple author configurations face significant risk of unauthorized access, data compromise, and potential complete system takeover if this vulnerability is exploited.
Mitigation strategies for this vulnerability should prioritize immediate patching of the Serendipity platform to version 0.8.1 or later, which includes proper access control enforcement for file uploads. System administrators should implement additional security measures including restrictive file type validation, upload directory permissions hardening, and implementation of web application firewalls to monitor and block suspicious upload attempts. The principle of least privilege should be enforced by ensuring that author accounts have minimal necessary permissions and that all file upload operations are properly authenticated and authorized through robust access control lists. Network segmentation and monitoring of file upload activities can provide additional layers of defense against exploitation attempts targeting this specific vulnerability.