CVE-2010-2728 in Outlook
Summary
by MITRE
Heap-based buffer overflow in Microsoft Outlook 2002 SP3, 2003 SP3, and 2007 SP2, when Online Mode for an Exchange Server is enabled, allows remote attackers to execute arbitrary code via a crafted e-mail message, aka "Heap Based Buffer Overflow in Outlook Vulnerability."
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 01/21/2025
This vulnerability represents a critical heap-based buffer overflow flaw in Microsoft Outlook versions 2002 SP3, 2003 SP3, and 2007 SP2 that becomes exploitable when Online Mode is enabled for Exchange Server connections. The vulnerability stems from insufficient input validation during the processing of email messages that contain maliciously crafted data structures. When Outlook processes such malformed email content, the application fails to properly bounds-check heap memory allocations, leading to a buffer overflow condition that can be leveraged by remote attackers to execute arbitrary code with the privileges of the affected user. The flaw specifically manifests when Outlook attempts to parse and render email content that exceeds the allocated buffer space, causing memory corruption that can be manipulated to overwrite critical program execution pointers or return addresses.
The technical exploitation of this vulnerability aligns with common software security principles and follows established attack patterns documented in the ATT&CK framework under the technique of code injection. The heap-based nature of the overflow places this vulnerability in CWE-121, which specifically addresses buffer overflow conditions in heap memory structures. The attack vector requires remote delivery of a malicious email message through an Exchange Server connection, making it particularly dangerous in enterprise environments where users frequently access email through online mode. The vulnerability is classified as a remote code execution flaw because an attacker can craft an email message that, when opened by an affected Outlook user, triggers the buffer overflow condition without requiring any local interaction or user-specific actions beyond opening the malicious message.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise when attackers leverage the privilege escalation capabilities inherent in the Windows operating environment. A successful exploitation could allow attackers to establish persistent backdoors, exfiltrate sensitive data, or deploy additional malware payloads within the corporate network. The vulnerability affects organizations using legacy versions of Microsoft Outlook that remain in production environments, representing a significant security gap that requires immediate attention and remediation. Organizations with users accessing Exchange Server through Online Mode are particularly at risk, as this mode of operation actively processes email content in ways that trigger the vulnerable code paths. The vulnerability's exploitation requires minimal user interaction, making it particularly dangerous for social engineering campaigns that rely on users opening seemingly legitimate email messages.
Mitigation strategies for this vulnerability should encompass immediate deployment of Microsoft security patches and updates, alongside network-based protections such as email filtering solutions that can detect and quarantine malicious email content before it reaches user inboxes. Security administrators should consider implementing network segmentation and access controls to limit the potential damage from successful exploitation attempts. The vulnerability also highlights the importance of maintaining up-to-date software versions and implementing comprehensive security monitoring solutions that can detect anomalous behavior indicative of exploitation attempts. Organizations should also consider disabling Online Mode for Exchange Server connections where possible, as this reduces the attack surface by preventing the vulnerable code paths from being triggered during normal email processing operations. Additionally, regular security awareness training for users can help reduce the risk of successful exploitation through social engineering approaches that rely on user interaction with malicious email content.