CVE-2005-2341 in BlackBerry Enterprise Server
Summary
by MITRE
Heap-based buffer overflow in Research in Motion (RIM) BlackBerry Attachment Service allows remote attackers to cause a denial of service (hang) via an e-mail attachment with a crafted TIFF file.
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Analysis
by VulDB Data Team • 07/19/2024
The vulnerability identified as CVE-2005-2341 represents a critical heap-based buffer overflow within the Research in Motion BlackBerry Attachment Service component. This flaw specifically affects the processing of email attachments, particularly those containing TIFF image files that have been deliberately crafted to exploit the vulnerability. The BlackBerry Enterprise Server and BlackBerry Internet Service platforms are impacted, as they utilize this Attachment Service to handle incoming email attachments for mobile device synchronization. The vulnerability resides in how the system parses and processes TIFF file formats, which are commonly used for email attachments due to their widespread support across different email clients and mobile platforms. When a maliciously constructed TIFF file is received as an email attachment, the Attachment Service fails to properly validate the file structure before attempting to parse it, leading to memory corruption in the heap allocation area.
The technical implementation of this vulnerability demonstrates a classic heap-based buffer overflow condition where insufficient bounds checking occurs during TIFF file processing. When the BlackBerry system attempts to read and process the malformed TIFF data, it allocates memory on the heap to store the parsed image information, but the parsing routine does not properly verify that the data being read fits within the allocated buffer space. This allows an attacker to craft a TIFF file with oversized or malformed data structures that exceed the allocated heap memory boundaries, causing memory corruption that results in system instability. The flaw specifically manifests during the decompression and rendering phases of TIFF file handling, where the system attempts to convert the image data into a format suitable for mobile device display. The vulnerability is particularly dangerous because it can be triggered through standard email communication channels, making it accessible to remote attackers without requiring physical access or elevated privileges.
The operational impact of this vulnerability extends beyond simple denial of service, as the heap corruption can potentially lead to more severe system instability or even system crashes that require manual intervention to restore normal operation. When exploited, the vulnerability causes the BlackBerry Attachment Service to hang or become unresponsive, effectively preventing legitimate email attachments from being processed and delivered to mobile devices. This creates significant disruption for enterprise users who rely on BlackBerry email services for business communications, as their mobile devices may fail to receive important emails or attachments until the service is manually restarted. The vulnerability affects the availability of email services within the BlackBerry ecosystem, particularly impacting organizations that depend on BlackBerry Enterprise Server for managing corporate email traffic and mobile device communications. The hanging behavior also creates potential for cascading failures in email processing workflows, as the service may not properly recover from the overflow condition, leading to extended periods of email service degradation.
Mitigation strategies for CVE-2005-2341 should focus on both immediate patching and operational controls to prevent exploitation. The most effective approach involves applying the official security patches provided by Research in Motion that address the heap overflow in the TIFF file processing routine. Organizations should also implement email filtering mechanisms that can identify and quarantine suspicious TIFF attachments before they reach the BlackBerry Attachment Service. Network-level controls can be deployed to block or scan email traffic containing potentially malicious TIFF files, particularly those with unusual file sizes or header structures. From a defensive perspective, implementing proper input validation and bounds checking within the Attachment Service would prevent the heap corruption from occurring, as specified in the CWE-121 standard for buffer overflow conditions. The ATT&CK framework categorizes this vulnerability under the T1203 technique for "Exploitation for Defense Evasion" when considering how attackers might leverage such flaws to disrupt services, while also aligning with T1190 for "Exploit Public-Facing Application" as the attack vector through email services. Organizations should also consider implementing monitoring and alerting systems to detect unusual patterns in Attachment Service behavior that might indicate exploitation attempts. Regular security assessments and vulnerability scanning should be conducted to identify similar heap-based buffer overflow conditions that might exist in other components of the BlackBerry platform, as this represents a broader class of memory corruption vulnerabilities that require comprehensive defensive measures.