CVE-2021-27620 : What You Need to Know

A detailed overview of CVE-2021-27620, a vulnerability in SAP Internet Graphics Service that allows for a network-based attack resulting in system crash.

Understanding CVE-2021-27620

This section dives into the nature and impact of the CVE-2021-27620 vulnerability.

What is CVE-2021-27620?

The CVE-2021-27620 vulnerability affects SAP Internet Graphics Service versions 7.20, 7.20EXT, 7.53, 7.20_EX2, and 7.81. It enables an unauthenticated attacker to trigger an internal memory corruption error in the system by submitting a malicious IGS request after retrieving an existing system state value. This subsequently causes the system to crash, rendering it unavailable. Notably, no data within the system can be viewed or modified during this attack.

The Impact of CVE-2021-27620

With a CVSS v3.0 base score of 5.9 (Medium severity), this vulnerability poses a significant risk to affected systems. An attacker can exploit this flaw to disrupt system availability, leading to potential service outages and downtime.

Technical Details of CVE-2021-27620

Explore the specific technical aspects related to CVE-2021-27620 for a better understanding.

Vulnerability Description

The vulnerability stems from insufficient input validation in the Ups::AddPart() method, allowing attackers to trigger internal memory corruption errors.

Affected Systems and Versions

SAP Internet Graphics Service versions < 7.20, < 7.20EXT, < 7.53, < 7.20_EX2, and < 7.81 are confirmed to be impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by retrieving a system state value and submitting a malicious IGS request over the network, which triggers the memory corruption error.

Mitigation and Prevention

Discover the necessary steps to mitigate the risks associated with CVE-2021-27620 and prevent potential exploitation.

Immediate Steps to Take

Apply recommended security patches provided by SAP promptly to address the vulnerability and prevent exploitation.

Long-Term Security Practices

Regularly update and maintain software to ensure the latest security enhancements and patches are implemented.
Employ network segmentation and access controls to limit exposure to potential attacks.

Patching and Updates

Keep the SAP Internet Graphics Service updated with the latest security patches and fixes to safeguard against known vulnerabilities.