CVE-2021-43814 : Exploit Details and Defense Strategies

Rizin is a reverse engineering framework and command-line toolset that is affected by a heap-based out-of-bounds write vulnerability in versions up to and including 0.3.1.

Understanding CVE-2021-43814

Rizin software versions <= 0.3.1 are susceptible to a heap-based out-of-bounds write vulnerability when reversing AMD64 ELF binaries with DWARF debug info.

What is CVE-2021-43814?

CVE-2021-43814 refers to a security flaw in Rizin where a heap-based out-of-bounds write occurs during the parsing of dwarf DIE info in AMD64 ELF binaries.

The Impact of CVE-2021-43814

The vulnerability may lead to Rizin crashing or executing unintended actions when a malicious AMD64 ELF binary is opened by a user. The issue has a CVSS base score of 7.7, indicating a high severity level.

Technical Details of CVE-2021-43814

Rizin's vulnerability can be further understood through its technical aspects.

Vulnerability Description

The vulnerability stems from a heap-based out-of-bounds write in the parse_die() function of Rizin, affecting AMD64 ELF binaries with DWARF debug info.

Affected Systems and Versions

Product: Rizin
Vendor: rizinorg
Versions affected: <= 0.3.1

Exploitation Mechanism

The flaw can be exploited by crafting a malicious AMD64 ELF binary, which when opened by a victim user triggers the out-of-bounds write, potentially leading to crashes or unauthorized actions.

Mitigation and Prevention

Protecting systems from CVE-2021-43814 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Rizin to a version beyond 0.3.1 to mitigate the vulnerability.

Long-Term Security Practices

Regularly update and patch software to prevent security vulnerabilities.
Implement robust security measures to detect and prevent malicious files.

Patching and Updates

Users are strongly advised to upgrade Rizin to a version higher than 0.3.1 to address the heap-based out-of-bounds write vulnerability.