CVE-2018-6948 : Security Advisory and Response

CCN-lite 2 is susceptible to a buffer overflow vulnerability in the ccnl_prefix_to_str_detailed function, potentially leading to a security breach.

Understanding CVE-2018-6948

This CVE pertains to a buffer overflow issue in CCN-lite 2, specifically in the ccnl_prefix_to_str_detailed function.

What is CVE-2018-6948?

The vulnerability arises when writing a prefix to the buffer buf in CCN-lite 2. The buffer has a maximum size of CCNL_MAX_PREFIX_SIZE, but when NFN is enabled, additional characters like "NFN" and "R2C" tags are written, causing a potential overflow.

The Impact of CVE-2018-6948

Exploiting this vulnerability by sending an NFN-R2C packet with a prefix of size CCNL_MAX_PREFIX_SIZE can result in a buffer overflow within ccnl_prefix_to_str_detailed.

Technical Details of CVE-2018-6948

CCN-lite 2's vulnerability is detailed below:

Vulnerability Description

The buffer overflow occurs in the ccnl_prefix_to_str_detailed function due to the writing of extra characters beyond the buffer's capacity.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: Not applicable

Exploitation Mechanism

Attackers can exploit the vulnerability by sending a specially crafted NFN-R2C packet with a prefix of size CCNL_MAX_PREFIX_SIZE.

Mitigation and Prevention

Protect your systems from CVE-2018-6948 with the following steps:

Immediate Steps to Take

Disable NFN if not required to mitigate the risk of buffer overflow.
Implement input validation to ensure that the prefix size does not exceed the buffer's capacity.

Long-Term Security Practices

Regularly update CCN-lite 2 to the latest version to patch known vulnerabilities.
Conduct security audits and code reviews to identify and address potential buffer overflow issues.

Patching and Updates

Stay informed about security advisories related to CCN-lite 2 and promptly apply patches to address vulnerabilities.