CVE-2025-34102 in CryptoLog
Summary
by MITRE • 07/10/2025
A remote code execution vulnerability exists in CryptoLog (PHP version, discontinued since 2009) due to a chained exploitation of SQL injection and command injection vulnerabilities. An unauthenticated attacker can gain shell access as the web server user by first exploiting a SQL injection flaw in login.php to bypass authentication, followed by command injection in logshares_ajax.php to execute arbitrary operating system commands.
The login bypass is achieved by submitting crafted SQL via the user POST parameter. Once authenticated, the attacker can abuse the lsid POST parameter in the logshares_ajax.php endpoint to inject and execute a command using $(...) syntax, resulting in code execution under the web context.
This exploitation path does not exist in the ASP.NET version of CryptoLog released since 2009.
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Analysis
by VulDB Data Team • 07/11/2025
This vulnerability represents a critical remote code execution flaw in CryptoLog PHP version that has been discontinued since 2009, making it a legacy security issue with potentially widespread impact. The vulnerability chain combines two distinct exploit vectors that together create a complete attack path allowing an unauthenticated attacker to achieve full system compromise. The exploitation begins with a SQL injection vulnerability in the login.php component where attackers can manipulate the user POST parameter to bypass authentication mechanisms entirely. This type of vulnerability aligns with CWE-89 which specifically addresses SQL injection flaws that allow attackers to manipulate database queries and gain unauthorized access to systems. The SQL injection vulnerability is particularly dangerous because it operates without authentication requirements, allowing attackers to craft malicious payloads that manipulate the database query logic to bypass the authentication process entirely.
The second component of this attack chain involves command injection in the logshares_ajax.php endpoint, which occurs after successful authentication bypass. The vulnerability manifests through the lsid POST parameter where attackers can inject operating system commands using the $(...) syntax. This command injection vulnerability enables arbitrary code execution within the context of the web server user, effectively providing attackers with shell access to the compromised system. The command injection aspect of this vulnerability maps directly to CWE-78 which defines improper neutralization of special elements used in OS commands, allowing attackers to execute arbitrary commands on the underlying operating system. The combination of these two vulnerabilities creates a chained attack scenario that is particularly dangerous because it requires minimal initial access and provides maximum operational impact.
The operational impact of this vulnerability extends beyond simple code execution to include complete system compromise and potential lateral movement within network environments. When an attacker successfully exploits this vulnerability, they gain shell access with the privileges of the web server user, which typically has limited but potentially exploitable permissions. The attack chain's progression from authentication bypass to command execution demonstrates how legacy systems can harbor multiple interconnected vulnerabilities that amplify the overall security risk. This vulnerability is particularly concerning because it affects a discontinued product that likely lacks ongoing security updates or patches, meaning organizations that may still be running this software are exposed to attacks that could have been mitigated through proper software lifecycle management.
The exploitation path is specifically designed to target the PHP version of CryptoLog while the ASP.NET version released since 2009 appears to have been properly secured against these attack vectors. This distinction highlights the importance of proper security implementation across different technology platforms and demonstrates how vendor security practices can vary significantly between different product versions. Organizations should consider this vulnerability in the context of the MITRE ATT&CK framework, particularly focusing on techniques related to command and control, privilege escalation, and persistence mechanisms. The attack chain represents a classic example of how multiple vulnerabilities can be chained together to achieve more sophisticated attacks, and this approach is commonly documented in ATT&CK techniques related to exploitation and execution. The vulnerability also emphasizes the critical need for proper input validation and output encoding, as both SQL injection and command injection vulnerabilities stem from inadequate sanitization of user-supplied data in the application's input handling mechanisms.