CVE-2017-7657 : Vulnerability Insights and Analysis

In Eclipse Jetty, versions 9.2.x and older, 9.3.x, and 9.4.x are affected by a vulnerability related to handling transfer-encoding chunks, potentially allowing bypassing of authorization.

Understanding CVE-2017-7657

This CVE involves a vulnerability in how Eclipse Jetty handles transfer-encoding chunks, potentially leading to security issues.

What is CVE-2017-7657?

Eclipse Jetty versions 9.2.x and older, 9.3.x, and 9.4.x are susceptible to a flaw in chunk length parsing, allowing for misinterpretation of chunk sizes and content, potentially leading to bypassing of authorization.

The Impact of CVE-2017-7657

The vulnerability could be exploited to bypass authorization imposed by an intermediary if Jetty is deployed behind such a system allowing large chunks to pass through unchanged.

Technical Details of CVE-2017-7657

Eclipse Jetty versions 9.2.x and older, 9.3.x, and 9.4.x are affected by this vulnerability.

Vulnerability Description

The flaw lies in the handling of transfer-encoding chunks, where chunk length parsing is vulnerable to integer overflow, potentially leading to misinterpretation of chunk sizes and content.

Affected Systems and Versions

Eclipse Jetty versions 9.2.x and older
Eclipse Jetty version 9.3.x (all configurations)
Eclipse Jetty version 9.4.x (non-default configuration with RFC2616 compliance enabled)

Exploitation Mechanism

Large chunk sizes could be mistakenly interpreted as smaller sizes
Content sent as a chunk body could be misconstrued as a pipelined request

Mitigation and Prevention

Immediate Steps to Take:

Update Eclipse Jetty to a non-vulnerable version
Implement network-level controls to mitigate potential exploitation Long-Term Security Practices:
Regularly monitor for security advisories and updates
Conduct security assessments to identify vulnerabilities
Implement secure coding practices

Patching and Updates

Apply patches provided by Eclipse Foundation
Stay informed about security updates and advisories