Allegra downloadExportedChart डाइरेक्टरी ट्रैवर्सल ऑथेंटिकेशन बाईपास भेद्यता

The impact of CVE-2023-51639 is severe due to the ease of exploitation and the potential for unauthorized access. An attacker can bypass authentication entirely, meaning no credentials are required to trigger the vulnerability. This allows them to traverse the file system and potentially download confidential data, modify system files, or execute arbitrary code if the underlying system has further vulnerabilities. The lack of authentication makes this vulnerability particularly concerning, as it significantly broadens the attack surface and lowers the barrier to entry for malicious actors. Successful exploitation could lead to a complete compromise of the Allegra installation and potentially the underlying server.

Organizations using Allegra for data visualization and reporting are at risk, particularly those running the affected versions (7.5.0.24–7.5.0.24). Shared hosting environments where multiple users share the same Allegra instance are especially vulnerable, as a compromised account could be used to exploit this vulnerability and access data belonging to other users.

• linux / server: Monitor access logs for requests to the downloadExportedChart endpoint with unusual or manipulated path parameters. Use grep to search for patterns indicative of directory traversal attempts (e.g., ../, ..\).

grep '../' /var/log/apache2/access.log

• generic web: Use curl to test the downloadExportedChart endpoint with various path traversal payloads. Inspect the response headers and content for signs of unauthorized file access.

curl 'http://allegra-server/downloadExportedChart?file=../../../../etc/passwd' -s

1. 2024-11-22Disclosure

   disclosure

1. आरक्षित2023-12-20
2. प्रकाशित2024-11-22
3. संशोधित2024-11-25
4. EPSS अद्यतन2026-04-02

The primary mitigation for CVE-2023-51639 is to upgrade Allegra to version 7.5.1 or later, which contains the necessary fix. If immediate upgrading is not possible, consider implementing temporary workarounds. While a direct WAF rule is difficult without knowing the exact file paths being targeted, restricting access to the downloadExportedChart endpoint and implementing strict input validation on any file path parameters could offer some limited protection. Thoroughly review and restrict file system permissions to minimize the potential damage from a successful attack. After upgrading, confirm the vulnerability is resolved by attempting to access a file outside of the intended directory via the downloadExportedChart action; it should be denied.