CVE-2019-19012 : Vulnerability Insights and Analysis

Oniguruma 6.x before 6.9.4_rc2 allows an attacker to control the offset of an out-of-bounds read through an integer overflow in the search_in_range function.

Understanding CVE-2019-19012

This CVE involves a vulnerability in Oniguruma 6.x before version 6.9.4_rc2 that allows attackers to manipulate the offset of an out-of-bounds read.

What is CVE-2019-19012?

The search_in_range function in regexec.c in Oniguruma 6.x before 6.9.4_rc2 enables attackers to influence the offset of an out-of-bounds read due to an integer overflow. This vulnerability impacts only the 32-bit compiled version, allowing attackers to exploit it using a malicious regular expression.

The Impact of CVE-2019-19012

Attackers can achieve denial-of-service, information disclosure, or other unspecified consequences by leveraging this vulnerability.

Technical Details of CVE-2019-19012

This section delves into the technical aspects of the CVE.

Vulnerability Description

An integer overflow in the search_in_range function in regexec.c in Oniguruma 6.x before 6.9.4_rc2 leads to an out-of-bounds read, with the attacker controlling the read offset. Remote attackers can exploit this to cause denial-of-service, information disclosure, or other impacts through a crafted regular expression.

Affected Systems and Versions

Only the 32-bit compiled version of Oniguruma 6.x before 6.9.4_rc2 is affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by using a malicious regular expression to control the offset of an out-of-bounds read.

Mitigation and Prevention

Protective measures to address CVE-2019-19012.

Immediate Steps to Take

Update Oniguruma to version 6.9.4_rc2 or later to mitigate the vulnerability.
Monitor for any unusual activities that could indicate exploitation of this issue.

Long-Term Security Practices

Regularly update software and libraries to the latest versions to patch known vulnerabilities.
Implement input validation and sanitization to prevent malicious inputs.

Patching and Updates

Apply patches and updates provided by Oniguruma promptly to address security issues.