CVE-2017-7443 : Security Advisory and Response

HTTP response splitting vulnerability in apt-cacher and apt-cacher-ng versions earlier than 1.7.15 and 3.4 respectively.

Understanding CVE-2017-7443

HTTP response splitting vulnerability in apt-cacher and apt-cacher-ng versions.

What is CVE-2017-7443?

HTTP response splitting is possible in versions earlier than 1.7.15 of apt-cacher and versions earlier than 3.4 of apt-cacher-ng due to encoded newline characters and lack of blocking for the %0[ad] regular expression.

The Impact of CVE-2017-7443

Allows attackers to manipulate HTTP responses
Potential for various attacks like cross-site scripting (XSS) and cache poisoning

Technical Details of CVE-2017-7443

HTTP response splitting vulnerability technical details.

Vulnerability Description

Vulnerability in apt-cacher and apt-cacher-ng versions
Caused by encoded newline characters and lack of blocking for %0[ad] regular expression

Affected Systems and Versions

apt-cacher versions earlier than 1.7.15
apt-cacher-ng versions earlier than 3.4

Exploitation Mechanism

Attackers can insert malicious HTTP headers
Manipulate client-side cache and deceive users

Mitigation and Prevention

Steps to mitigate and prevent CVE-2017-7443.

Immediate Steps to Take

Update apt-cacher and apt-cacher-ng to versions 1.7.15 and 3.4 respectively
Monitor and filter HTTP responses for malicious content

Long-Term Security Practices

Implement secure coding practices to prevent HTTP response splitting
Regularly update and patch software to address vulnerabilities

Patching and Updates

Apply patches provided by the software vendors
Stay informed about security updates and advisories