Executive Summary

CVE-2017-20226 is a stack-based buffer overflow vulnerability found in Mapscrn version 2.0.3 and earlier. It occurs when a local attacker supplies an oversized input buffer, which overflows the stack memory.

The attacker crafts a malicious buffer containing junk data, a manipulated return address, NOP sled instructions, and shellcode. This crafted input causes the stack to overflow, allowing the attacker to execute arbitrary code or cause a denial of service.

Technically, the vulnerability arises from unsafe use of the strcpy function where source and destination buffers overlap, leading to out-of-bounds writes and memory corruption.

Useful 0 Not Useful 0

Impact Analysis

This vulnerability can have serious impacts including arbitrary code execution and denial of service.

• An attacker with local access can execute malicious code with the privileges of the Mapscrn process.
• Exploitation can lead to full compromise of the affected system's confidentiality, integrity, and availability.
• Failed exploit attempts can cause the application to crash, resulting in denial-of-service conditions.

Useful 0 Not Useful 0

Detection Guidance

This vulnerability is a local stack-based buffer overflow in Mapscrn version 2.0.3 and earlier, exploitable by providing an oversized input buffer. Detection involves checking if the vulnerable Mapscrn binary is present on the system.

You can detect the presence of the vulnerable Mapscrn binary by running commands to check its version or existence, for example:

• Check if mapscrn is installed and its version: `mapscrn --version` or `strings /usr/bin/mapscrn | grep 2.0.3`
• Verify the binary path and permissions: `ls -l /usr/bin/mapscrn`

Since the exploit involves supplying an oversized input buffer, monitoring for abnormal crashes or segmentation faults (SIGSEGV) related to mapscrn execution in system logs may also help detect exploitation attempts.

Useful 0 Not Useful 0

Mitigation Strategies

Immediate mitigation steps include:

• Remove or disable the vulnerable Mapscrn 2.0.3 binary if it is not required.
• Restrict local access to systems running Mapscrn to trusted users only, since the attack vector is local.
• Monitor system logs for crashes or suspicious activity related to Mapscrn.
• Apply any available patches or updates from the vendor or package maintainers that address this buffer overflow vulnerability.

Because the vulnerability allows arbitrary code execution with the privileges of the Mapscrn process, limiting execution privileges and running Mapscrn with minimal permissions can reduce impact.

Useful 0 Not Useful 0

Compliance Impact

CVE-2017-201726 is a high-severity stack-based buffer overflow vulnerability that allows local attackers to execute arbitrary code with high impact on confidentiality, integrity, and availability.

Because the vulnerability can lead to unauthorized code execution and potential compromise of system confidentiality, integrity, and availability, it may negatively affect compliance with standards and regulations such as GDPR and HIPAA, which require protection of sensitive data and system integrity.

However, the provided information does not explicitly discuss compliance implications or specific impacts on regulatory requirements.

Useful 0 Not Useful 0