{"id":34490,"date":"2025-05-04T23:05:19","date_gmt":"2025-05-04T23:05:19","guid":{"rendered":""},"modified":"2025-09-12T05:18:18","modified_gmt":"2025-09-12T11:18:18","slug":"cve-2021-42028-critical-vulnerability-in-syngo-fastview-allowing-remote-code-execution","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2021-42028-critical-vulnerability-in-syngo-fastview-allowing-remote-code-execution\/","title":{"rendered":"CVE-2021-42028: Critical Vulnerability in syngo fastView Allowing Remote Code Execution<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The cybersecurity world is once again threatened by a newly discovered vulnerability, CVE-2021-42028, that targets the popular application, syngo fastView. This vulnerability affects all versions of the application and opens up a potential pathway for attackers to execute code within the context of the current process, posing a significant risk to system integrity and data security.
\nConsidered a critical flaw with a CVSS severity score of 7.8, it is a matter of urgency for all users of syngo fastView<\/a> to understand the implications of this vulnerability, the risks it presents, and the steps needed to mitigate its impact. This blog post aims to provide a comprehensive breakdown of this significant cybersecurity<\/a> issue and provide practical guidance for its mitigation.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2021-42028
\nSeverity: Critical (CVSS 7.8)
\nAttack Vector: Network
\nPrivileges Required: Low
\nUser Interaction: Required
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

syngo fastView<\/a> | All versions<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The vulnerability lies in the way syngo fastView validates user-supplied data<\/a> when parsing BMP files. An attacker could craft a malicious BMP file that, when processed by the application, causes an out-of-bounds write<\/a> past the end of an allocated structure.
\nThis condition can lead to a buffer overflow<\/a>, a classic memory corruption issue, which can be exploited to execute arbitrary code. The code would run in the context of the current process, which could lead to a complete system<\/a> compromise if the process runs with high privileges.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

While we won’t provide a direct exploit code for ethical and security<\/a> reasons, we can illustrate the concept with a pseudocode:<\/p>\n

# Pseudocode\ndef exploit(target):\nbmp_file = create_malicious_bmp()\nsend_bmp_to_target(target, bmp_file)\ndef create_malicious_bmp():\n# Create a BMP file with malicious payload which causes buffer overflow\nbmp_file = BMPFile()\nbmp_file.add_malicious_payload()\nreturn bmp_file\ndef send_bmp_to_target(target, bmp_file):\n# Send the BMP file to the target\ntarget.receive_bmp(bmp_file)<\/code><\/pre>\n
In simple terms, the attacker creates a malicious BMP file that causes a buffer overflow<\/a> when processed by syngo fastView. The attacker then sends this malicious BMP file to the target<\/a>, which, when opened, executes the malicious payload.
\nRemember, this is a simplified explanation to help understand the exploit process. Actual exploits could be much more complex and involve advanced techniques to bypass security<\/a> measures.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
Users are advised to apply the latest patches provided by the vendor. In the absence of a patch, or where patching is not immediately feasible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) could serve as a temporary mitigation. These tools can help detect and block malicious payloads before they reach the application<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity world is once again threatened by a newly discovered vulnerability, CVE-2021-42028, that targets the popular application, syngo fastView. This vulnerability affects all versions of the application and opens up a potential pathway for attackers to execute code within the context of the current process, posing a significant risk to system integrity and […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-34490","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-rce"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t