CVE-2018-25018 : Security Advisory and Response

An out-of-bounds write vulnerability was discovered in UnRAR versions 5.6.1.7 to 5.7.4 and 6.0.3. This vulnerability occurs during a memcpy operation in the QuickOpen::ReadRaw function when it is called from QuickOpen::ReadNext.

Understanding CVE-2018-25018

This CVE involves an out-of-bounds write vulnerability in specific versions of UnRAR.

What is CVE-2018-25018?

CVE-2018-25018 is an out-of-bounds write vulnerability found in UnRAR versions 5.6.1.7 to 5.7.4 and 6.0.3.

The Impact of CVE-2018-25018

The vulnerability allows for unauthorized write access beyond the boundaries of allocated memory, potentially leading to a crash or arbitrary code execution.

Technical Details of CVE-2018-25018

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability occurs during a memcpy operation in the QuickOpen::ReadRaw function when called from QuickOpen::ReadNext in UnRAR versions 5.6.1.7 to 5.7.4 and 6.0.3.

Affected Systems and Versions

UnRAR versions 5.6.1.7 to 5.7.4
UnRAR version 6.0.3

Exploitation Mechanism

The vulnerability is exploited by triggering the memcpy operation in the QuickOpen::ReadRaw function.

Mitigation and Prevention

Protecting systems from CVE-2018-25018 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update UnRAR to a patched version that addresses the vulnerability.
Monitor for any unusual activities on the system that could indicate exploitation.

Long-Term Security Practices

Regularly update software and systems to prevent known vulnerabilities.
Implement proper input validation to prevent buffer overflows and out-of-bounds write vulnerabilities.
Conduct security assessments and audits regularly to identify and address potential security issues.

Patching and Updates

Ensure that all systems running UnRAR are updated to versions that have patched the out-of-bounds write vulnerability.