CVE-2023-27286: IBM Aspera Cargo Buffer Overflow Flaw

CVE-2023-27286 Overview

CVE-2023-27286 is a buffer overflow vulnerability affecting IBM Aspera Cargo 4.2.5 and IBM Aspera Connect 4.2.5. The vulnerability is caused by improper bounds checking, which allows an attacker to overflow a buffer and execute arbitrary code on the affected system. This vulnerability has been assigned IBM X-Force ID: 248616.

Critical Impact

An unauthenticated remote attacker can exploit this buffer overflow vulnerability to execute arbitrary code on affected systems, potentially leading to complete system compromise, data exfiltration, or lateral movement within an organization's network.

Affected Products

• IBM Aspera Cargo 4.2.5
• IBM Aspera Connect 4.2.5

Discovery Timeline

• April 2, 2023 - CVE-2023-27286 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-27286

Vulnerability Analysis

This vulnerability falls under CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). The flaw exists due to insufficient bounds checking in IBM Aspera Cargo and Aspera Connect applications. When processing certain input, the application fails to properly validate the size of data being written to memory buffers, allowing attackers to write beyond the allocated buffer boundaries.

IBM Aspera products are commonly used for high-speed file transfer across networks, making them attractive targets for attackers seeking to compromise enterprise file transfer infrastructure. The network-accessible nature of these applications increases the risk profile, as attackers can potentially exploit this vulnerability remotely without requiring prior authentication or user interaction.

Root Cause

The root cause of CVE-2023-27286 is improper bounds checking within the IBM Aspera Cargo and Aspera Connect applications. The vulnerable code fails to validate input length before copying data into fixed-size memory buffers. This classic buffer overflow condition occurs when the application allocates a buffer of a specific size but does not verify that incoming data fits within those bounds before the write operation occurs.

Attack Vector

This vulnerability can be exploited over the network without requiring authentication or user interaction. An attacker can craft malicious input that exceeds the expected buffer size, causing the application to write data beyond the allocated memory boundaries. By carefully crafting the overflow payload, an attacker can overwrite adjacent memory structures, potentially including return addresses or function pointers, enabling arbitrary code execution with the privileges of the affected application.

The attack does not require elevated privileges and can be executed remotely, making it particularly dangerous in environments where IBM Aspera products are exposed to untrusted networks or the internet.

Detection Methods for CVE-2023-27286

Indicators of Compromise

• Unexpected crashes or application instability in IBM Aspera Cargo or Aspera Connect processes
• Anomalous memory consumption or access violations in application logs
• Suspicious network traffic patterns targeting Aspera services
• Unexpected child processes spawned by Aspera applications

Detection Strategies

• Monitor IBM Aspera application logs for buffer-related errors, memory access violations, or unexpected application crashes
• Implement network intrusion detection signatures for malformed or oversized requests targeting Aspera services
• Deploy endpoint detection and response (EDR) solutions to monitor for exploitation attempts and post-exploitation behavior

Monitoring Recommendations

• Enable detailed logging for IBM Aspera Cargo and Connect applications to capture potential exploitation attempts
• Configure SIEM alerts for unusual activity patterns associated with Aspera processes
• Implement memory protection monitoring to detect attempted buffer overflow exploitation

How to Mitigate CVE-2023-27286

Immediate Actions Required

• Identify all instances of IBM Aspera Cargo 4.2.5 and IBM Aspera Connect 4.2.5 in your environment
• Apply the security patches provided by IBM immediately
• Restrict network access to Aspera services to trusted networks and IP ranges until patches can be applied
• Monitor affected systems for signs of compromise

Patch Information

IBM has released security updates to address this vulnerability. Administrators should consult the IBM Support Patch Information page for detailed instructions on obtaining and applying the appropriate patches. Additional technical details can be found in the IBM X-Force Vulnerability Report.

Workarounds

• Implement network segmentation to limit exposure of Aspera services to untrusted networks
• Deploy web application firewalls (WAF) or intrusion prevention systems (IPS) with rules to detect and block potential buffer overflow attempts
• Consider disabling affected services temporarily if patches cannot be applied immediately and the risk is deemed unacceptable
• Implement strict access controls to limit which users and systems can connect to Aspera services