CVE-2025-8204: Comodo Dragon Browser HSTS Handling Vulnerability
A low-severity vulnerability has been identified in Comodo Dragon browser (up to version 134.0.6998.179). This flaw relates to the HSTS (HTTP Strict Transport Security) handler, potentially allowing for a bypass of security checks. While the attack complexity is high and exploitation may be difficult, a proof-of-concept exploit is publicly available. This post provides a detailed analysis of the vulnerability, its potential impact, and recommended mitigation strategies.
Vulnerability Details
- CVE ID: CVE-2025-8204
- Description: The vulnerability lies within the HSTS handler of Comodo Dragon, where improper manipulation can lead to a bypass of security checks designed to enforce HTTPS connections.
- CVSS Score: 3.1 (LOW)
- CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
- CVSS Explanation: This vulnerability has a low base score because while it's remotely exploitable, it requires high attack complexity and user interaction (the user must be tricked into performing an action). The integrity impact is low, meaning that an attacker might be able to modify some data, but without significant consequences.
- Exploit Requirements: Successful exploitation requires the attacker to convince a user to interact with a crafted network request or website, and the exploit complexity is high.
- Affected Vendor: Comodo
- Affected Product: Dragon Browser
- Affected Version: Up to 134.0.6998.179
- CWE: CWE-358 - Improper Handling of Security Features
- CWE Explanation: This CWE refers to situations where a software application doesn't correctly manage or implement security mechanisms, leading to potential vulnerabilities. In this case, the HSTS handling is flawed.
Timeline of Events
- Received Date: 2025-07-26
- Disclosure Date: Public exploit available (date unspecified).
- Vendor Contact: The vendor was contacted but did not respond.
Exploitability & Real-World Risk
While the CVSS score is low and the attack complexity is high, the existence of a public proof-of-concept exploit increases the risk. In a real-world scenario, an attacker might attempt to leverage this vulnerability through phishing attacks or by compromising websites visited by Comodo Dragon users. Although the impact is limited to potential integrity compromise, it can still be used in conjunction with other vulnerabilities for more severe attacks.
Recommendations
Given the vendor's lack of response, immediate patching is unlikely. Here's what users can do:
- Exercise Caution: Be wary of suspicious links and websites.
- Consider Alternatives: Evaluate switching to a more actively maintained browser with a better security track record.
- Enable Enhanced Security Features: Utilize browser extensions or settings that offer enhanced security and privacy, such as those that block malicious scripts and ads.
Technical Insight
The vulnerability appears to stem from an issue in how Comodo Dragon handles HSTS policies. HSTS is a mechanism that forces browsers to connect to websites over HTTPS, even if the user types `http://`. A successful exploit would likely involve bypassing this enforcement, potentially allowing an attacker to perform man-in-the-middle attacks or inject malicious content.
Credit to Researcher(s)
The vulnerability was reported by an anonymous researcher and documented by VulDB.
References
- https://news.fmisec.com/comodo-dragon-vulnerability
- https://vuldb.com/?ctiid.317773
- https://vuldb.com/?id.317773
- https://vuldb.com/?submit.615647
Tags
#ComodoDragon #HSTS #SecurityCheck #CVE-2025-8204 #BrowserSecurity
Summary: CVE-2025-8204 describes a low-severity vulnerability in Comodo Dragon's HSTS handling, potentially allowing attackers to bypass security checks. While the exploit complexity is high, a public PoC exists, urging users to exercise caution or consider alternative browsers.
CVE ID: CVE-2025-8204
Risk Analysis: Successful exploitation could allow an attacker to bypass HSTS enforcement, potentially leading to man-in-the-middle attacks or the injection of malicious content. While the impact is limited to potential integrity compromise, it could be chained with other vulnerabilities for more severe consequences.
Recommendation: Users should exercise caution when browsing, avoiding suspicious links and websites. Switching to a more actively maintained browser with a strong security track record is recommended. Enabling enhanced security features within the browser can also provide added protection.
Timeline
- 2025-07-26: Vulnerability details received and published.