CVE-2017-3077 in Flash Player
Summary
by MITRE
Adobe Flash Player versions 25.0.0.171 and earlier have an exploitable memory corruption vulnerability in the PNG image parser. Successful exploitation could lead to arbitrary code execution.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 01/27/2025
Adobe Flash Player contained a critical memory corruption vulnerability within its PNG image parser component that affected versions 25.0.0.171 and earlier. This vulnerability stems from improper input validation and memory handling when processing specially crafted PNG image files, creating a condition where attacker-controlled data can overwrite memory locations beyond the intended buffer boundaries. The flaw manifests as a heap-based buffer overflow that occurs during the parsing of PNG image headers and metadata, specifically when the parser fails to properly validate the length of image data structures before attempting to copy or process them. This type of vulnerability falls under CWE-121 heap-based buffer overflow, which represents a common class of memory safety issues that have historically led to remote code execution exploits. The vulnerability is particularly dangerous because it can be triggered through web browsers that have Flash Player installed, making it an attractive target for attackers who can deliver malicious PNG files through compromised websites or email attachments. When exploited, the memory corruption allows attackers to execute arbitrary code with the privileges of the Flash Player process, which typically runs with the same permissions as the user browsing the malicious content. The attack vector leverages the widespread deployment of Flash Player across different operating systems and browsers, making it a significant threat to enterprise environments where users frequently encounter web content that may contain embedded Flash elements. The exploitation process typically involves crafting a malicious PNG file with oversized or malformed data structures that cause the parser to write beyond allocated memory regions, potentially allowing for stack or heap overwrite attacks that can redirect program execution flow. This vulnerability aligns with ATT&CK technique T1203, which describes the use of malicious content to gain execution privileges, and specifically targets the execution phase of the attack lifecycle. Organizations that had not yet patched their Flash Player installations faced a high risk of compromise, as the vulnerability could be exploited without requiring user interaction beyond visiting a malicious website, making it particularly dangerous in phishing campaigns and drive-by download attacks. The technical complexity of the exploit required careful manipulation of PNG format structures to ensure successful memory corruption while maintaining the integrity of the overall file structure to avoid detection by basic validation checks.
The operational impact of CVE-2017-3077 extended beyond simple code execution to encompass complete system compromise when combined with other attack techniques. Attackers could leverage this vulnerability as part of multi-stage attack chains where the initial exploitation provided a foothold for further reconnaissance and lateral movement within networks. The memory corruption vulnerability was particularly effective in bypassing modern exploit mitigations such as stack canaries and address space layout randomization because the heap overflow allowed for more predictable memory layout manipulation. Security researchers noted that the vulnerability's exploitation was relatively straightforward compared to other Flash Player vulnerabilities, which contributed to its widespread use in automated attack tools and exploit kits. The vulnerability's presence in widely deployed software versions meant that organizations across different sectors, including financial services, healthcare, and government institutions, were potentially exposed to attack. Network defenders had to implement comprehensive monitoring solutions to detect unusual Flash Player activity or attempts to load malicious PNG content, as the attack could occur silently without user awareness. The vulnerability also highlighted the risks associated with legacy software maintenance, as many organizations continued to support older Flash Player versions long after security patches were available, creating persistent attack surfaces. Incident response teams needed to develop specialized procedures for handling Flash-based exploits, including memory analysis techniques to identify the specific memory corruption patterns associated with this vulnerability. The widespread nature of the vulnerability meant that security vendors had to rapidly develop signatures and detection rules to identify compromised systems, with many organizations implementing network-level blocking of Flash content as a temporary mitigation measure.
Mitigation strategies for CVE-2017-3077 focused on immediate patching of affected Flash Player installations, as Adobe released security updates that addressed the memory corruption issue in their PNG parser. Organizations that could not immediately patch were advised to implement network-level controls to block Flash content from untrusted sources, including configuring web proxies to filter out flash objects and disabling Flash Player plugins entirely in browsers. The vulnerability demonstrated the importance of maintaining up-to-date software deployments and implementing automated patch management processes to prevent exploitation of known vulnerabilities. Security professionals recommended that enterprises conduct comprehensive vulnerability assessments to identify all systems running outdated Flash Player versions, particularly those that were not regularly updated as part of standard maintenance procedures. The incident also emphasized the need for application whitelisting policies that would prevent execution of unauthorized Flash content, as well as browser sandboxing techniques that could limit the damage if exploitation did occur. Organizations implemented enhanced monitoring for suspicious Flash Player behavior, including tracking memory allocation patterns and detecting attempts to execute code in protected memory regions. The vulnerability highlighted the critical importance of the principle of least privilege, where Flash Player should run with minimal system permissions to limit potential damage from successful exploits. Many enterprises ultimately decided to phase out Flash Player entirely from their environments, recognizing that the ongoing security risks outweighed the benefits of supporting legacy multimedia content. The incident served as a catalyst for broader security awareness initiatives, emphasizing that even seemingly benign software components could contain critical vulnerabilities that could be exploited for complete system compromise. Security teams also developed specific response procedures for handling Flash-based exploits, including forensic analysis techniques to determine the exact nature of memory corruption and the methods used to achieve code execution. The vulnerability's exploitation patterns were documented in security bulletins and shared across threat intelligence communities, helping other organizations prepare for similar attacks and improve their defensive measures.