CVE-2010-0503 in Mac OS X
Summary
by MITRE
Use-after-free vulnerability in iChat Server in Apple Mac OS X Server 10.5.8 allows remote authenticated users to execute arbitrary code or cause a denial of service (application crash) via unspecified vectors.
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Analysis
by VulDB Data Team • 05/04/2026
The vulnerability identified as CVE-2010-0503 represents a critical use-after-free flaw within Apple's iChat Server component that operates on Mac OS X Server 10.5.8. This type of vulnerability occurs when a program continues to reference memory locations after they have been freed, creating a scenario where subsequent operations on that memory can lead to unpredictable behavior including code execution or system instability. The issue specifically affects the iChat Server application which provides instant messaging and collaboration services within Apple's server ecosystem.
The technical nature of this vulnerability stems from improper memory management practices within the iChat Server implementation. When processing certain network requests or user interactions, the server fails to properly validate or manage memory references, leading to situations where freed memory blocks are accessed or reused. This use-after-free condition creates a potential exploitation vector that remote authenticated attackers can leverage to manipulate the application's memory state. The vulnerability does not require special privileges beyond authentication, making it particularly dangerous as it can be exploited by users who have legitimate access credentials to the system.
From an operational perspective, this vulnerability presents significant risks to organizations relying on Mac OS X Server 10.5.8 for their communication infrastructure. The ability to execute arbitrary code remotely means that attackers could potentially gain full system control, escalate privileges, install malware, or establish persistent backdoors within the network. Additionally, the denial of service component of this vulnerability could disrupt critical communication services, affecting business operations and potentially causing financial losses. The impact extends beyond individual system compromise as iChat Server often serves as a foundational component for enterprise collaboration environments.
The vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions in software implementations. From an adversary perspective, this flaw maps to several ATT&CK tactics including execution through legitimate system binaries, privilege escalation via memory corruption, and persistence mechanisms that could be established through code execution. Security professionals should note that this vulnerability represents a classic memory safety issue that highlights the importance of proper memory management practices in server applications. Organizations should prioritize immediate patching of affected systems and implement network segmentation to limit potential attack vectors. The vulnerability also underscores the necessity of regular security assessments and code reviews to identify similar memory management flaws in other applications. Given the age of Mac OS X Server 10.5.8, organizations should consider migrating to supported versions that include improved memory safety mechanisms and regular security updates to prevent exploitation of similar vulnerabilities.