CVE-2026-23648: Glory RBG-100 Privilege Escalation Flaw

CVE-2026-23648 Overview

Glory RBG-100 recycler systems using the ISPK-08 software component contain multiple system binaries with overly permissive file permissions. Several binaries executed by the root user are writable and executable by unprivileged local users. An attacker with local access can replace or modify these binaries to execute arbitrary commands with root privileges, enabling local privilege escalation.

Critical Impact

Local attackers can achieve full root privileges on Glory RBG-100 recycler systems by exploiting insecure file permissions on system binaries, potentially compromising critical financial infrastructure.

Affected Products

• Glory RBG-100 recycler systems
• ISPK-08 software component
• Systems with insecure binary file permissions

Discovery Timeline

• 2026-02-17 - CVE CVE-2026-23648 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2026-23648

Vulnerability Analysis

This vulnerability is classified under CWE-732 (Incorrect Permission Assignment for Critical Resource). The core issue stems from improper file permission configurations on system binaries within the Glory RBG-100 recycler system running the ISPK-08 software component.

The affected binaries are executed with root privileges during normal system operation, but the file permissions allow unprivileged local users to write to and execute these files. This creates a classic local privilege escalation scenario where an attacker with limited user access can inject malicious code into these binaries, which will subsequently execute with elevated privileges when the system invokes them.

Glory RBG-100 systems are cash recycler devices commonly deployed in banking and retail environments, making this vulnerability particularly concerning for financial infrastructure security.

Root Cause

The root cause is incorrect permission assignment for critical system resources. During software deployment or system configuration, the file permissions on multiple system binaries were set with world-writable or group-writable permissions, violating the principle of least privilege. This allows any local user to modify executable files that run with root privileges.

Attack Vector

The attack requires local access to the Glory RBG-100 system. An attacker with a low-privileged user account can identify the writable system binaries, replace or modify them with malicious payloads, and wait for the system to execute these binaries as root. The malicious code then runs with full root privileges, providing complete control over the affected recycler system.

The vulnerability exploitation flow typically involves:

1. Identifying writable binaries owned by root or executed with elevated privileges
2. Creating a malicious replacement binary or modifying the existing binary
3. Waiting for normal system operation to trigger execution of the compromised binary
4. Achieving arbitrary command execution as root

Detection Methods for CVE-2026-23648

Indicators of Compromise

• Unexpected modification timestamps on system binaries in the ISPK-08 software directories
• File hash mismatches compared to known-good binary checksums
• Unusual processes running as root that originate from modified binaries
• Evidence of privilege escalation attempts in system logs

Detection Strategies

• Implement file integrity monitoring (FIM) on all system binaries to detect unauthorized modifications
• Monitor for changes in file permissions on critical executables
• Audit local user activity for suspicious file write operations to system directories
• Deploy endpoint detection solutions capable of identifying privilege escalation patterns

Monitoring Recommendations

• Enable comprehensive logging for file system operations on the ISPK-08 software directories
• Configure alerts for any write operations to binaries executed by root
• Monitor for new user accounts or privilege changes that could indicate post-exploitation activity
• Review access logs for unusual local authentication patterns

How to Mitigate CVE-2026-23648

Immediate Actions Required

• Audit file permissions on all system binaries within the ISPK-08 software component
• Correct overly permissive permissions to restrict write access to root only
• Implement file integrity monitoring to detect unauthorized binary modifications
• Restrict local access to Glory RBG-100 systems to only essential personnel

Patch Information

Consult the Glory Global Homepage for official security updates and patches. Review the VulnCheck Advisory - Glory RBG-100 for detailed technical guidance and remediation steps.

Workarounds

• Remove write permissions for non-root users on all affected system binaries using chmod 755 or more restrictive permissions
• Implement mandatory access control using SELinux or AppArmor policies to restrict binary modification
• Enable immutable file attributes on critical binaries using chattr +i where operationally feasible
• Segment network access to Glory RBG-100 systems to limit lateral movement opportunities

# Configuration example - Correct file permissions on system binaries
# Identify binaries with insecure permissions
find /path/to/ispk-08/binaries -type f -perm /022 -exec ls -la {} \;

# Remove write permissions for group and others
chmod 755 /path/to/ispk-08/binaries/*

# Set immutable attribute on critical binaries (optional, requires root)
chattr +i /path/to/ispk-08/binaries/critical_binary