CVE-2022-28690 in Cscape Csfont
Summary
by MITRE • 06/02/2022
The affected product is vulnerable to an out-of-bounds write via uninitialized pointer, which may allow an attacker to execute arbitrary code.
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Analysis
by VulDB Data Team • 06/06/2022
The vulnerability identified as CVE-2022-28690 represents a critical memory safety issue affecting a software product through an out-of-bounds write condition triggered by an uninitialized pointer. This flaw falls under the category of memory corruption vulnerabilities that can potentially lead to arbitrary code execution, making it a significant concern for system security and integrity. The vulnerability manifests when the software attempts to write data beyond the allocated memory boundaries, specifically through the use of an uninitialized pointer variable that has not been properly validated or initialized before use.
The technical root cause of this vulnerability stems from improper memory management practices within the affected software components. When a pointer variable is declared but not explicitly initialized, it contains indeterminate values from the previous memory contents, creating a dangerous scenario where the program may attempt to write data to memory locations that are either invalid or controlled by an attacker. This uninitialized pointer can point to any arbitrary memory location, and when the program attempts to write data to this location, it results in an out-of-bounds write condition that can overwrite critical program data, function pointers, or other memory structures essential for proper program execution.
The operational impact of CVE-2022-28690 extends beyond simple memory corruption, as it creates a potential exploitation vector for attackers seeking to gain unauthorized access or execute malicious code within the target system. An attacker who successfully exploits this vulnerability could potentially overwrite critical memory segments such as return addresses, function pointers, or stack canaries, leading to complete system compromise. This vulnerability aligns with CWE-457, which specifically addresses the use of uninitialized variables in software development, and represents a direct pathway for exploitation that could be leveraged in various attack scenarios including privilege escalation, denial of service, or complete system takeover.
From a threat modeling perspective, this vulnerability follows patterns commonly associated with the attack technique described in the MITRE ATT&CK framework under T1059.007 for command and scripting interpreter, where an attacker might leverage arbitrary code execution to gain persistent access or escalate privileges. The vulnerability's exploitation potential is particularly concerning given that uninitialized pointer dereferences can often be triggered through normal program operation or through crafted input data, making it difficult to predict and prevent without proper code review and memory safety mechanisms. The out-of-bounds write condition can potentially be exploited in various contexts including network-based attacks, file processing operations, or any scenario where user-provided input is processed by the vulnerable software component.
The mitigation strategies for CVE-2022-28690 should focus on both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities from occurring. Immediate fixes should include proper initialization of all pointer variables, implementation of bounds checking mechanisms, and comprehensive code reviews to identify other uninitialized variables that may present similar risks. Developers should implement static analysis tools and dynamic memory debugging techniques to detect uninitialized pointer usage during the development phase. Additionally, the software should incorporate memory safety features such as stack canaries, address space layout randomization, and data execution prevention mechanisms to make exploitation more difficult even if similar vulnerabilities are present. Organizations should also establish secure coding practices that emphasize the importance of initializing all variables and validating memory operations before execution, aligning with industry standards and best practices for secure software development.
Security professionals should prioritize patching systems running vulnerable software versions as soon as possible, as this vulnerability represents a high-severity risk that can be exploited remotely without requiring authentication. The vulnerability's potential for arbitrary code execution makes it particularly dangerous in environments where the affected software is exposed to untrusted input or network traffic. Continuous monitoring and threat hunting should be implemented to detect any potential exploitation attempts, while incident response procedures should be updated to address the specific characteristics of this vulnerability type. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of successful exploitation attempts, particularly in environments where the vulnerable software may be running with elevated privileges or access to sensitive data.