Plattform
other
Komponente
allegra
Behoben in
7.5.1
CVE-2023-51640 describes a Remote Code Execution (RCE) vulnerability discovered in Allegra. This flaw allows authenticated attackers to bypass authentication and execute arbitrary code on affected systems. The vulnerability impacts Allegra versions 7.5.0 build 29 and earlier. A fix is available in version 7.5.1.
The core of this vulnerability lies in the extarctZippedFile method, which fails to properly validate user-supplied paths before using them in file operations. This lack of validation enables a directory traversal attack. An attacker can craft a malicious ZIP file containing path traversal sequences that, when processed by Allegra, allow them to access and potentially overwrite arbitrary files on the system. Successful exploitation grants the attacker the ability to execute code in the context of the LOCAL SERVICE account, which typically has elevated privileges, potentially leading to complete system compromise. The ability to bypass authentication significantly lowers the barrier to entry for attackers.
This vulnerability was disclosed on 2024-11-22. While no public proof-of-concept (PoC) code has been publicly released, the relatively straightforward nature of directory traversal vulnerabilities suggests that a PoC could emerge. The ZDI-CAN identifier suggests this vulnerability was reported through a coordinated disclosure process. The CVSS score of 7.2 (HIGH) indicates a significant risk, and the ability to bypass authentication makes exploitation more likely. It is not currently listed on the CISA KEV catalog.
Organizations utilizing Allegra for data processing or reporting, particularly those with legacy configurations or shared hosting environments, are at risk. Systems where the LOCAL SERVICE account has elevated privileges are especially vulnerable.
disclosure
Exploit-Status
EPSS
1.32% (80% Perzentil)
CISA SSVC
CVSS-Vektor
The primary mitigation for CVE-2023-51640 is to upgrade Allegra to version 7.5.1 or later, which contains the necessary fix. If immediate upgrading is not feasible, consider implementing temporary workarounds. While a direct WAF rule is difficult to implement due to the nature of the directory traversal, restricting access to the extarctZippedFile functionality or implementing strict input validation on any user-provided file paths could offer limited protection. Monitor system logs for unusual file access patterns or unexpected process executions, particularly those related to the LOCAL SERVICE account. After upgrading, confirm the fix by attempting to trigger the vulnerable functionality with a crafted ZIP file containing path traversal sequences; the operation should now fail with an appropriate error.
Actualizar Allegra a la versión 7.5.1 o posterior. Esta actualización corrige la vulnerabilidad de recorrido de directorios y ejecución remota de código.
Schwachstellenanalysen und kritische Warnungen direkt in deinen Posteingang.
CVE-2023-51640 is a Remote Code Execution vulnerability in Allegra, allowing attackers to execute arbitrary code by bypassing authentication due to insufficient path validation in the extarctZippedFile method.
You are affected if you are running Allegra versions 7.5.0 build 29 or earlier. Upgrade to 7.5.1 to mitigate the risk.
Upgrade Allegra to version 7.5.1 or later. If upgrading is not immediately possible, implement stricter access controls and monitor system logs.
Currently, there are no publicly known active exploitation campaigns, but the vulnerability's severity warrants proactive mitigation.
Refer to the Allegra vendor advisory for detailed information and updates regarding CVE-2023-51640.
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