CVE-2025-34102 is a critical remote code execution vulnerability affecting the PHP version of Crypttech's CryptoLog product, which has been discontinued since 2009. The vulnerability arises from a chained exploitation involving two distinct flaws: an SQL injection (CWE-89) in the login.php endpoint and a command injection (CWE-78) in the logshares_ajax.php endpoint. An unauthenticated attacker can exploit the SQL injection vulnerability by submitting specially crafted SQL code via the 'user' POST parameter to bypass authentication controls. This allows the attacker to gain unauthorized access without valid credentials. Once authenticated through this bypass, the attacker can then exploit a command injection vulnerability by manipulating the 'lsid' POST parameter in the logshares_ajax.php endpoint. This parameter is improperly sanitized and allows injection of arbitrary operating system commands using the $(...) syntax. Consequently, the attacker can execute arbitrary commands with the privileges of the web server user, effectively gaining shell access on the underlying system. The chained nature of this exploit means that no prior authentication or user interaction is required, significantly increasing the attack surface and ease of exploitation. Notably, this vulnerability does not affect the ASP.NET version of CryptoLog released after 2009, which presumably includes mitigations or architectural changes preventing this attack vector. The CVSS 4.0 base score is 9.3, reflecting the critical severity due to the combination of network attack vector, no required privileges or user interaction, and high impact on confidentiality, integrity, and availability. There are no known exploits in the wild at the time of publication, and no patches have been released, likely due to the product's discontinued status. The vulnerability also involves improper input validation (CWE-20) and missing authentication (CWE-306), compounding the risk. Overall, this vulnerability represents a severe threat to any organization still operating the vulnerable PHP version of CryptoLog, enabling full system compromise remotely and without authentication.

For European organizations, the impact of this vulnerability can be substantial, particularly for those still using legacy or discontinued software like the PHP version of CryptoLog. Successful exploitation results in complete compromise of the affected web server, allowing attackers to execute arbitrary commands, potentially leading to data theft, service disruption, lateral movement within networks, and deployment of further malware or ransomware. Confidentiality is severely impacted as attackers can access sensitive logs or data stored within CryptoLog. Integrity is compromised as attackers can alter logs or system files, undermining forensic investigations and trustworthiness of records. Availability can be disrupted by attackers deleting files or launching denial-of-service conditions. Since CryptoLog is a logging solution, its compromise can blind security monitoring and incident response capabilities, increasing the risk of undetected intrusions. European organizations in critical infrastructure sectors, government, finance, and healthcare that rely on CryptoLog for logging and audit trails are particularly at risk. The lack of patches and the discontinued status of the product complicate remediation, potentially forcing organizations to replace the software entirely or isolate affected systems. The vulnerability’s unauthenticated, remote exploitability means attackers can target exposed web servers directly from the internet, increasing the likelihood of exploitation in environments with inadequate network segmentation or firewall protections.

Given the discontinued status of the PHP version of CryptoLog and absence of official patches, European organizations should prioritize the following mitigations: 1) Immediate identification and inventory of all CryptoLog PHP installations within the network. 2) Isolate affected systems from public internet access using network segmentation and firewall rules to restrict inbound traffic to trusted sources only. 3) Replace the PHP version of CryptoLog with the supported ASP.NET version or an alternative secure logging solution that receives regular security updates. 4) If immediate replacement is not feasible, implement Web Application Firewall (WAF) rules to detect and block SQL injection and command injection patterns targeting the 'user' and 'lsid' POST parameters. 5) Conduct thorough access control reviews and harden web server configurations to minimize privileges of the web server user, limiting potential damage from exploitation. 6) Enable and monitor detailed logging and intrusion detection systems to identify suspicious activities related to SQL injection or command injection attempts. 7) Educate IT and security teams about the risks of legacy software and the importance of timely upgrades or decommissioning unsupported products. 8) Consider deploying application-layer proxies or input validation mechanisms to sanitize inputs if source code modifications are possible, although this is a temporary and less reliable mitigation. These steps collectively reduce exposure and risk while preparing for a secure migration away from vulnerable software.