CVE-2012-2532 in IIS
Summary
by MITRE
Microsoft FTP Service 7.0 and 7.5 for Internet Information Services (IIS) processes unspecified commands before TLS is enabled for a session, which allows remote attackers to obtain sensitive information by reading the replies to these commands, aka "FTP Command Injection Vulnerability."
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 04/19/2021
The CVE-2012-2532 vulnerability represents a critical security flaw in Microsoft's FTP Service version 7.0 and 7.5 integrated within Internet Information Services. This vulnerability stems from the improper handling of FTP commands within the TLS negotiation process, creating a window of opportunity for malicious actors to exploit the service before secure communication is fully established. The flaw specifically targets the sequence in which commands are processed, allowing attackers to inject commands and potentially extract sensitive information from the FTP service responses.
The technical nature of this vulnerability lies in the timing discrepancy between command processing and TLS encryption establishment. During the initial FTP session setup, certain commands are executed before the Transport Layer Security protocol is fully negotiated and implemented. This creates a scenario where attackers can send crafted commands that are processed by the FTP service before encryption is active, enabling them to intercept and analyze the service responses. The vulnerability manifests as an information disclosure issue where sensitive data can be retrieved through the replies generated by the FTP service in response to these pre-TLS commands.
The operational impact of CVE-2012-2532 extends beyond simple information disclosure, as it provides attackers with a foothold for more sophisticated attacks within FTP environments. Security professionals must recognize that this vulnerability operates at the protocol level, potentially allowing unauthorized access to user credentials, directory listings, file contents, and other sensitive operational data. The vulnerability is particularly concerning in enterprise environments where FTP services are commonly used for file transfers, making it a prime target for reconnaissance and data exfiltration activities. The attack vector requires minimal privileges and can be executed remotely, making it especially dangerous for organizations with exposed FTP services.
Organizations should implement immediate mitigations including applying the relevant Microsoft security updates, disabling FTP services where possible, and implementing network segmentation to limit exposure. The vulnerability aligns with CWE-200, which addresses "Information Exposure," and can be categorized under ATT&CK technique T1071.004 for application layer protocol usage. Security monitoring should focus on detecting unusual command sequences and unexpected responses from FTP services, while network administrators should consider implementing strict firewall rules to restrict FTP traffic to trusted sources only. The remediation process requires careful planning to avoid disrupting legitimate FTP operations while ensuring the vulnerability is properly addressed.