CVE-2020-27790 : What You Need to Know
Discover the UPX vulnerability in PackLinuxElf64::invert_pt_dynamic() function that could lead to a denial of service attack. Learn about the impact, affected systems, and mitigation steps.
A floating point exception issue in UPX could lead to a denial of service attack due to a crash triggered by a crafted input file.
Understanding CVE-2020-27790
This CVE involves a vulnerability in UPX that could be exploited by an attacker to cause a denial of service.
What is CVE-2020-27790?
The issue was found in the PackLinuxElf64::invert_pt_dynamic() function of the p_lx_elf.cpp file in UPX. An attacker could exploit this flaw by using a specially crafted input file to trigger a crash, resulting in a denial of service. The primary impact is on Availability.
The Impact of CVE-2020-27790
The vulnerability could allow an attacker to crash the system, leading to a denial of service attack.
Technical Details of CVE-2020-27790
This section provides more technical insights into the CVE.
Vulnerability Description
The vulnerability in UPX is due to a floating point exception issue in the PackLinuxElf64::invert_pt_dynamic() function of the p_lx_elf.cpp file.
Affected Systems and Versions
- Product: UPX
- Vendor: Not applicable
- Versions affected: Fixed in v3.96
Exploitation Mechanism
An attacker can exploit this vulnerability by providing a specially crafted input file to trigger the crash.
Mitigation and Prevention
Protect your systems from CVE-2020-27790 with the following steps:
Immediate Steps to Take
- Update UPX to version v3.96 to mitigate the vulnerability.
- Monitor for any unusual system crashes or denial of service incidents.
Long-Term Security Practices
- Regularly update and patch software to prevent known vulnerabilities.
- Implement strong input validation mechanisms to prevent crafted file attacks.
Patching and Updates
Ensure timely patching and updates for UPX to address security vulnerabilities.