CVE-2019-19590 : What You Need to Know
Learn about CVE-2019-19590, an integer overflow vulnerability in radare2 versions 4.0 and below, allowing remote attackers to trigger denial of service or execute unauthorized code. Find mitigation steps and prevention measures here.
In versions 4.0 and below of radare2, an integer overflow vulnerability exists in the function r_asm_massemble in libr/asm/asm.c. This flaw can lead to a Use-After-Free scenario, allowing remote attackers to trigger a denial of service or execute unauthorized code.
Understanding CVE-2019-19590
This CVE entry describes a critical vulnerability in radare2 versions 4.0 and earlier, highlighting the potential for remote exploitation.
What is CVE-2019-19590?
CVE-2019-19590 is an integer overflow vulnerability in radare2 versions 4.0 and below, specifically in the function r_asm_massemble in libr/asm/asm.c. The issue arises due to an integer overflow in the variable new_token_size, leading to a Use-After-Free scenario.
The Impact of CVE-2019-19590
The vulnerability allows remote attackers to exploit the integer overflow, potentially causing a denial of service (application crash) or executing unauthorized code by providing carefully crafted input.
Technical Details of CVE-2019-19590
This section provides detailed technical insights into the vulnerability.
Vulnerability Description
The flaw in radare2 versions 4.0 and earlier involves an integer overflow in the variable new_token_size within the function r_asm_massemble in libr/asm/asm.c. This results in a Use-After-Free scenario where buffer tokens can be filled with malicious data after being freed.
Affected Systems and Versions
- Product: radare2
- Vendor: N/A
- Versions affected: 4.0 and below
Exploitation Mechanism
The vulnerability can be exploited remotely by manipulating input to trigger the integer overflow, leading to a Use-After-Free scenario and potential unauthorized code execution.
Mitigation and Prevention
Protecting systems from CVE-2019-19590 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Update radare2 to a patched version that addresses the integer overflow vulnerability.
- Monitor for any unusual activities or unauthorized access attempts.
Long-Term Security Practices
- Implement secure coding practices to prevent integer overflow vulnerabilities.
- Regularly update and patch software to mitigate known vulnerabilities.
Patching and Updates
Ensure that radare2 is regularly updated to the latest version to apply security patches and prevent exploitation of CVE-2019-19590.