The net/http package of Go contains a critical vulnerability that allows improper acceptance of a bare LF as a line terminator in chunked data chunk-size lines. This vulnerability allows request smuggling when the net/http server interacts with another server that incorrectly accepts a bare LF as part of a chunk extension. With a CVSS score of 9.1, this vulnerability poses a serious threat, as attackers may leverage this weakness to manipulate HTTP requests, potentially leading to unauthorized actions.
Risk to organizations includes significant impacts on confidentiality and integrity of data. Attackers could exploit this vulnerability to conduct unauthorized actions, including data manipulation or unauthorized access to sensitive information. Organizations using the net/http package should be aware of the implications of this vulnerability and take immediate action to mitigate potential risks.
Currently, there are no known exploits or public proof-of-concept (PoC) available, but the critical nature of this vulnerability necessitates urgent attention. Organizations should prioritize patching immediately to protect against potential exploitation.
Failure to address this vulnerability could lead to significant security breaches, making it imperative for organizations to act swiftly.
Vulnerability Details
The vulnerability exists in the net/http package, specifically due to the improper acceptance of a bare LF as a line terminator in chunked data chunk-size lines. This issue can permit request smuggling when a net/http server is used in conjunction with a server that erroneously accepts a bare LF as part of a chunk extension.
The CVSS score of 9.1 indicates that this vulnerability is critical, with high potential impacts on both confidentiality and integrity, while availability remains unaffected. Organizations should be aware of the implications of this vulnerability and prioritize it in their security posture.
Technical Analysis
The root cause of this vulnerability lies in the way the net/http package processes line terminators in chunked data. Attackers may leverage this flaw by sending specially crafted requests that exploit the server's improper handling of chunked data, allowing them to bypass security measures and manipulate HTTP requests.
The attack vector is network-based, requiring no privileges or user interaction, making it an easy target for remote attackers. The complexity of the attack is low, which further increases the risk of exploitation.
Risk & Impact Analysis
Organizations deploying applications that rely on the net/http package are at risk of significant security breaches. The potential for data manipulation and unauthorized access poses a serious threat to sensitive information and operational integrity.
The urgency of addressing this vulnerability cannot be overstated, given its high CVSS score and the implications of potential exploitation. Organizations should assess their exposure to this vulnerability and take immediate steps to remediate.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Specific version ranges affected are not explicitly stated; however, organizations should consider all versions of the net/http package prior to the release of a patch as potentially vulnerable.
Mitigation & Remediation
Organizations should prioritize patching immediately. Ensure that you are using the latest version of the net/http package to mitigate this vulnerability. If a patch is not available, consider implementing strict input validation to reject bare LF characters in chunked data.
Detection Guidance
Monitor logs for unusual patterns that may indicate attempts to exploit this vulnerability. Pay attention to malformed HTTP requests that may include unexpected chunked data.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-22871 highlights the need for thorough testing and validation of HTTP request handling in web applications. Security teams should stay informed about similar vulnerabilities in the future and integrate robust validation mechanisms to prevent potential exploits.
As this vulnerability represents a trend of request smuggling risks within web applications, organizations must adopt proactive security measures to address these challenges.
For insights on improving your security posture, consider reviewing our guide on penetration testing methodologies to identify potential vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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