CVE-2019-18408 : Security Advisory and Response

A use-after-free vulnerability in the libarchive library before version 3.4.0 can lead to exploitation in a specific scenario related to the function Ppmd7_DecodeSymbol.

Understanding CVE-2019-18408

The function archive_read_format_rar_read_data in libarchive has a critical use-after-free vulnerability.

What is CVE-2019-18408?

The vulnerability in archive_read_format_rar_read_data in libarchive before version 3.4.0 can result in a use-after-free issue when encountering ARCHIVE_FAILED, specifically related to the function Ppmd7_DecodeSymbol.

The Impact of CVE-2019-18408

The vulnerability can be exploited to execute arbitrary code or cause a denial of service (DoS) condition.

Technical Details of CVE-2019-18408

The technical aspects of the vulnerability are crucial for understanding its implications.

Vulnerability Description

The use-after-free vulnerability in archive_read_format_rar_read_data in libarchive before version 3.4.0 is triggered in a specific scenario involving ARCHIVE_FAILED, impacting the function Ppmd7_DecodeSymbol.

Affected Systems and Versions

Product: N/A
Vendor: N/A
Versions Affected: N/A

Exploitation Mechanism

The vulnerability can be exploited by an attacker to achieve remote code execution or initiate a DoS attack.

Mitigation and Prevention

Taking immediate steps and implementing long-term security practices are essential to mitigate the risks associated with CVE-2019-18408.

Immediate Steps to Take

Update libarchive to version 3.4.0 or later to address the vulnerability.
Monitor security advisories from relevant vendors for patches and updates.

Long-Term Security Practices

Regularly update software and libraries to the latest versions.
Conduct security assessments and audits to identify and remediate vulnerabilities promptly.

Patching and Updates

Apply patches provided by libarchive promptly to fix the use-after-free vulnerability.