CVE-2018-3759 : Exploit Details and Defense Strategies
Discover the impact of CVE-2018-3759, a vulnerability in private_address_check ruby gem before 0.5.0, leading to a time-of-check time-of-use race condition. Learn about affected systems, exploitation, and mitigation steps.
CVE-2018-3759 pertains to a security vulnerability in the private_address_check ruby gem before version 0.5.0, leading to a time-of-check time-of-use (TOCTOU) race condition. This CVE was made public on May 3, 2018, by HackerOne.
Understanding CVE-2018-3759
The vulnerability in the private_address_check ruby gem exposes a TOCTOU race condition due to improper verification of the socket's address, potentially allowing for the resolution of private addresses when DNS entries have a TTL of 0.
What is CVE-2018-3759?
The CVE-2018-3759 vulnerability involves a race condition in the private_address_check ruby gem, where the socket's address is not adequately verified, leading to potential exposure of private addresses.
The Impact of CVE-2018-3759
The vulnerability could be exploited to manipulate DNS entries with a TTL of 0, causing the resolution of private addresses instead of public ones, compromising the security and privacy of affected systems.
Technical Details of CVE-2018-3759
The technical aspects of CVE-2018-3759 include:
Vulnerability Description
The private_address_check ruby gem before version 0.5.0 is susceptible to a TOCTOU race condition due to inadequate verification of the socket's address.
Affected Systems and Versions
- Product: private_address_check ruby gem
- Vendor: HackerOne
- Vulnerable Version: 0.5.0
Exploitation Mechanism
The vulnerability can be triggered when DNS entries have a TTL of 0, leading to the resolution of private addresses instead of public ones.
Mitigation and Prevention
To address CVE-2018-3759, consider the following steps:
Immediate Steps to Take
- Update the private_address_check ruby gem to version 0.5.0 or later.
- Monitor DNS entries for any unusual resolutions.
Long-Term Security Practices
- Implement proper socket address verification mechanisms.
- Regularly review and update dependencies to mitigate potential vulnerabilities.
Patching and Updates
- Apply patches and updates provided by HackerOne or the official repository to fix the vulnerability and enhance system security.