CVE-2020-7054 : Exploit Details and Defense Strategies

MmsValue_decodeMmsData in libIEC61850 through 1.4.0 has a heap-based buffer overflow vulnerability when parsing the MMS_BIT_STRING data type.

Understanding CVE-2020-7054

This CVE involves a specific vulnerability in the libIEC61850 library.

What is CVE-2020-7054?

CVE-2020-7054 is a heap-based buffer overflow vulnerability found in the MmsValue_decodeMmsData function within the libIEC61850 library.

The Impact of CVE-2020-7054

This vulnerability could be exploited by an attacker to execute arbitrary code or cause a denial of service by triggering the buffer overflow.

Technical Details of CVE-2020-7054

The technical aspects of this CVE provide insight into the vulnerability and its implications.

Vulnerability Description

The vulnerability occurs in the MmsValue_decodeMmsData function in libIEC61850, leading to a heap-based buffer overflow when processing MMS_BIT_STRING data.

Affected Systems and Versions

Affected Version: libIEC61850 through 1.4.0
Specific Products and Vendors: Not applicable

Exploitation Mechanism

The vulnerability can be exploited by crafting malicious MMS_BIT_STRING data to trigger the buffer overflow, potentially leading to arbitrary code execution or denial of service.

Mitigation and Prevention

Addressing CVE-2020-7054 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update libIEC61850 to a patched version that addresses the heap-based buffer overflow.
Monitor for any signs of exploitation or unusual activities on the affected systems.

Long-Term Security Practices

Implement secure coding practices to prevent buffer overflows and other memory-related vulnerabilities.
Regularly update and patch software libraries to mitigate known vulnerabilities.

Patching and Updates

Ensure timely application of security patches and updates to all relevant systems and libraries to prevent exploitation of CVE-2020-7054.