CVE-2024-27447

Root

Cause

The vulnerability in pretix, a ticket shop application, stems from improper file validation during upload or processing [1]. The official description states that pretix before 2024.1.1 mishandles file validation [2]. This suggests that the application fails to adequately verify file types, contents, or metadata, which could allow malicious files to be accepted or processed incorrectly [1][2].

Exploitation

The exact attack vector is not detailed in the public sources, but the lack of proper validation could be exploited by an attacker who can upload files to the pretix system (e.g., event organizers or users with upload privileges). The attacker would not need advanced authentication bypass if the upload functionality is accessible to certain roles [1][2]. The vulnerability may be triggered through image uploads, CSV imports, or other file-handling features common in ticket shop software [4].

Impact

Successful exploitation could lead to unauthorized file processing, potential code execution if uploaded files are interpreted or executed, or information disclosure via crafted file content [1][2]. Given that pretix handles event data and potentially user information, the impact could include data integrity issues or further compromise of the server [4]. The CVSS score is not provided, but the mishandling of file validation is often rated high due to the risk of arbitrary file operations.

Mitigation

The vulnerability is fixed in pretix version 2024.1.1, released on 2024-02-26 [1][2]. Users are strongly advised to upgrade to this or a later version. The GitHub advisory database also lists this vulnerability (PYSEC-2024-253) as requiring an update [3]. No workarounds have been publicly documented, so updating is the recommended action.