CVE-2021-42374 : Exploit Details and Defense Strategies
Learn about the CVE-2021-42374 vulnerability in Busybox, leading to information leak and denial of service. Find out the impacted systems, exploitation, and mitigation steps.
Understanding CVE-2021-42374
What is CVE-2021-42374?
The CVE-2021-42374 vulnerability entails an out-of-bounds heap read in Busybox's unlzma applet, resulting in information disclosure and denial of service upon decompression of crafted LZMA-compressed input.
The Impact of CVE-2021-42374
This vulnerability allows for information leakage and denial of service attacks when specific compressed files are decompressed, affecting system integrity and potentially exposing sensitive data.
Technical Details of CVE-2021-42374
Vulnerability Description
The issue arises from Busybox's unlzma applet, leading to data exposure and service disruption during decompression.
Affected Systems and Versions
- Vendor: Busybox
- Product: Busybox
- Affected Version: Unspecified, less than 1.34.0
Exploitation Mechanism
The vulnerability can be exploited by utilizing crafted LZMA-compressed input, triggering the out-of-bounds heap read in the Busybox unlzma applet.
Mitigation and Prevention
Immediate Steps to Take
- Update Busybox to version 1.34.0 or later to mitigate the vulnerability.
- Implement network security controls to prevent maliciously crafted input.
Long-Term Security Practices
- Regularly monitor for security advisories and updates related to Busybox.
- Conduct periodic security assessments and audits to identify and remediate vulnerabilities.
Patching and Updates
Apply patches and software updates provided by Busybox to address the out-of-bounds heap read vulnerability.