CVE-2020-27787 : Vulnerability Insights and Analysis
Learn about CVE-2020-27787, a UPX vulnerability leading to a segmentation fault due to improper memory buffer restrictions, potentially causing denial of service. Find out how to mitigate this issue.
A Segmentaation fault was found in UPX in invert_pt_dynamic() function in p_lx_elf.cpp. An attacker with a crafted input file allows invalid memory address access that could lead to a denial of service.
Understanding CVE-2020-27787
This CVE involves a segmentation fault in UPX due to improper memory buffer restrictions, potentially leading to a denial of service.
What is CVE-2020-27787?
CVE-2020-27787 is a vulnerability in UPX that allows an attacker to trigger a segmentation fault by exploiting a flaw in the invert_pt_dynamic() function in p_lx_elf.cpp. This could result in unauthorized memory access and a denial of service.
The Impact of CVE-2020-27787
The impact of this vulnerability is the potential for a denial of service attack, where an attacker could exploit the flaw to crash the application or system, leading to service disruption.
Technical Details of CVE-2020-27787
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability in UPX is categorized under CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer. It stems from a segmentation fault in the invert_pt_dynamic() function in p_lx_elf.cpp.
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 crafted input file to UPX, triggering an invalid memory address access and potentially causing a denial of service.
Mitigation and Prevention
To address CVE-2020-27787, follow these mitigation strategies:
Immediate Steps to Take
- Update UPX to version 3.96, where the vulnerability is fixed.
- Avoid opening untrusted or suspicious UPX files.
Long-Term Security Practices
- Regularly update software and apply security patches.
- Implement proper input validation mechanisms to prevent malformed inputs.
Patching and Updates
Ensure timely patching and updates for UPX to mitigate the risk of exploitation.