CVE-2009-1647 in popcorn
Summary
by MITRE
Heap-based buffer overflow in popcorn.exe in Ultrafunk Popcorn 1.87 allows remote POP3 servers to cause a denial of service (application crash) via a long string in a +OK response. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 11/27/2024
The vulnerability identified as CVE-2009-1647 represents a critical heap-based buffer overflow flaw in the popcorn.exe component of Ultrafunk Popcorn version 1.87. This security weakness specifically affects the application's handling of POP3 protocol responses, creating a remote code execution risk that can be exploited through maliciously crafted server communications. The vulnerability stems from inadequate input validation mechanisms within the POP3 client implementation, where the application fails to properly sanitize or limit the length of strings received in +OK responses from POP3 servers.
The technical exploitation of this vulnerability occurs when a remote POP3 server sends an excessively long string in a positive response (+OK) to the popcorn.exe client application. This malformed input causes the application to write beyond the boundaries of allocated heap memory, resulting in memory corruption that ultimately leads to application instability and crash. The heap-based nature of the overflow indicates that the vulnerable code operates on dynamically allocated memory segments, making the exploitation more complex but equally dangerous as it can potentially be leveraged for more sophisticated attacks beyond simple denial of service.
From an operational impact perspective, this vulnerability creates significant security risks for organizations relying on Ultrafunk Popcorn for email retrieval and management functions. The remote denial of service condition effectively prevents legitimate users from accessing their email accounts through the affected application, disrupting business communications and potentially causing productivity losses. The vulnerability's remote exploitability means that attackers do not require local access or credentials to trigger the condition, making it particularly dangerous in environments where email clients interact with untrusted external servers.
This vulnerability aligns with CWE-121, which categorizes heap-based buffer overflow conditions as a fundamental memory safety issue that can lead to arbitrary code execution. The ATT&CK framework would classify this as a vulnerability exploitation technique under the T1210 category, specifically targeting weaknesses in network protocols and client applications. Organizations should consider this vulnerability as part of a broader attack surface assessment, particularly when evaluating email client security configurations and network segmentation strategies.
Mitigation strategies for CVE-2009-1647 should prioritize immediate patching of the Ultrafunk Popcorn application to the latest available version that contains fixed input validation mechanisms. Network administrators should implement additional protective measures including email server filtering, network segmentation to limit exposure to untrusted POP3 servers, and monitoring for anomalous POP3 traffic patterns. The implementation of proper input validation controls within the application code, including length limits and proper memory management practices, should be enforced to prevent similar issues in future deployments. Organizations should also consider alternative email clients that have demonstrated better security track records and more robust input handling capabilities to reduce overall risk exposure.