CVE-2008-4819 in Flash Player
Summary
by MITRE
Unspecified vulnerability in Adobe Flash Player 9.0.124.0 and earlier makes it easier for remote attackers to conduct DNS rebinding attacks via unknown vectors.
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Analysis
by VulDB Data Team • 08/20/2019
Adobe Flash Player versions 9.0.124.0 and earlier contain an unspecified vulnerability that significantly weakens the security boundaries designed to prevent DNS rebinding attacks. This flaw creates a dangerous condition where remote attackers can exploit the player's network handling mechanisms to bypass standard security restrictions. The vulnerability specifically impacts the way Flash Player manages DNS resolution and network connections, allowing malicious actors to manipulate domain name resolution in ways that were not intended by the security model. The unspecified nature of the exact flaw means that the vulnerability could stem from multiple potential weaknesses in the player's networking stack, including improper handling of DNS caching, insufficient validation of network responses, or flawed cross-domain policy enforcement. This weakness directly enables attackers to perform DNS rebinding attacks, which typically involve using a maliciously crafted Flash application to trick the victim's browser into making requests to internal network resources that would normally be restricted by the same-origin policy. The attack works by initially resolving a domain name to an external IP address that redirects to an internal network address, thereby allowing the attacker to bypass normal network security controls and potentially access sensitive internal systems or services that should remain isolated from external networks.
The operational impact of this vulnerability extends beyond simple network access bypasses and represents a significant threat to enterprise security environments. Organizations using affected Flash Player versions face increased risk of internal network reconnaissance, lateral movement attacks, and potential data exfiltration attempts. The vulnerability particularly affects environments where internal networks are not properly segmented from external access points, as attackers can leverage the DNS rebinding capabilities to probe internal services and identify potential targets for further exploitation. The attack vector is particularly concerning because it can be executed through standard web browsing activities without requiring any special privileges or complex attack chains. This makes the vulnerability extremely dangerous in enterprise environments where users may inadvertently visit malicious websites containing crafted Flash content. The vulnerability also impacts the fundamental security assumptions that organizations rely on for protecting their network infrastructure, as it undermines the trust relationships between external network access and internal system security boundaries.
Security professionals should consider this vulnerability in the context of broader attack patterns documented in the attack technique catalog, particularly those related to network-based reconnaissance and privilege escalation. The flaw aligns with several common attack patterns found in the attack technique framework where attackers exploit weaknesses in application-level network handling to bypass security controls. Organizations should prioritize immediate remediation through Flash Player updates, as this vulnerability was specifically addressed in subsequent releases. The mitigation strategy involves not only updating to patched versions but also implementing network-level controls to restrict Flash content execution, particularly in high-security environments. Additional protective measures include implementing proper network segmentation, using DNS filtering solutions, and monitoring for suspicious DNS resolution patterns that might indicate attempted DNS rebinding attacks. The vulnerability also highlights the importance of maintaining up-to-date security controls and the risks associated with legacy software components that may not receive continued security support. Organizations should conduct comprehensive vulnerability assessments to identify all systems running affected Flash Player versions and ensure that proper network controls are in place to minimize the impact of such vulnerabilities. This case demonstrates the critical importance of understanding how application-level network behavior can create unexpected security exposure points that may not be immediately apparent through traditional security assessments. The vulnerability serves as a reminder that even well-established security boundaries can be undermined by subtle flaws in network handling mechanisms, particularly in complex software environments where multiple security controls must work in concert to provide adequate protection.