CVE-2017-12966 Explained : Impact and Mitigation

A segmentation fault can be caused by a maliciously crafted .asn1 file when calling the asn1f_lookup_symbol_impl function in asn1fix_retrieve.c within the libasn1fix.a library of asn1c version 0.9.28.

Understanding CVE-2017-12966

This CVE-2017-12966 involves a vulnerability in the asn1c version 0.9.28 that allows remote attackers to trigger a denial of service through a crafted .asn1 file.

What is CVE-2017-12966?

The vulnerability in asn1c version 0.9.28 enables attackers to induce a denial of service (segmentation fault) by exploiting the asn1f_lookup_symbol_impl function in asn1fix_retrieve.c.

The Impact of CVE-2017-12966

The exploitation of this vulnerability can lead to a denial of service condition, potentially disrupting the normal operation of the affected system.

Technical Details of CVE-2017-12966

This section provides more in-depth technical insights into the CVE-2017-12966 vulnerability.

Vulnerability Description

The asn1f_lookup_symbol_impl function in asn1fix_retrieve.c within the libasn1fix.a library of asn1c version 0.9.28 is susceptible to exploitation by remote attackers, resulting in a denial of service via a specially crafted .asn1 file.

Affected Systems and Versions

Affected Systems: Not applicable
Affected Versions: asn1c version 0.9.28

Exploitation Mechanism

The vulnerability can be exploited by malicious actors through the manipulation of a specifically crafted .asn1 file, triggering a segmentation fault in the asn1f_lookup_symbol_impl function.

Mitigation and Prevention

To address CVE-2017-12966 and enhance system security, the following steps are recommended:

Immediate Steps to Take

Implement network filtering to restrict access to vulnerable systems.
Regularly monitor and analyze system logs for any unusual activities.

Long-Term Security Practices

Conduct regular security assessments and penetration testing to identify and remediate vulnerabilities.
Stay informed about security updates and patches released by the software vendor.

Patching and Updates

Apply the latest patches and updates provided by asn1c to mitigate the vulnerability and enhance system security.