CVE-2020-5360: Dell BSAFE Buffer Under-Read Vulnerability

CVE-2020-5360 Overview

Dell BSAFE Micro Edition Suite, versions prior to 4.5, contains a Buffer Under-Read vulnerability that can be exploited by unauthenticated remote attackers. This memory corruption flaw occurs when the software reads data from a location before the beginning of the intended buffer, potentially leading to undefined behavior or complete system crashes. As a widely-used cryptographic toolkit embedded in numerous enterprise applications including Oracle Database and Oracle HTTP Server, this vulnerability poses significant risks to organizations relying on these products for secure communications.

Critical Impact

An unauthenticated remote attacker can exploit this vulnerability over the network without any user interaction, potentially causing denial of service conditions through system crashes or undefined application behavior.

Affected Products

• Dell BSAFE Micro Edition Suite (versions prior to 4.5)
• Oracle Database 12.1.0.2, 12.2.0.1, 18c, and 19c Enterprise Edition
• Oracle HTTP Server 11.1.1.9.0, 12.1.3.0, and 12.2.1.4.0
• Oracle Security Service 11.1.1.9.0, 12.1.3.0, and 12.2.1.4.0
• Oracle WebLogic Server Proxy Plug-In 11.1.1.9.0, 12.1.3.0, and 12.2.1.4.0

Discovery Timeline

• December 16, 2020 - CVE-2020-5360 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2020-5360

Vulnerability Analysis

This vulnerability is classified as a Buffer Under-Read (CWE-127) and Out-of-Bounds Read (CWE-125) issue within the Dell BSAFE Micro Edition Suite cryptographic library. Buffer under-read vulnerabilities occur when software attempts to read memory from a position before the legitimate start of a buffer, potentially accessing adjacent memory regions that may contain sensitive data or cause application instability.

The vulnerability is particularly concerning because it affects a cryptographic library that is embedded within multiple Oracle enterprise products. When triggered, the flaw can cause the affected application to crash or exhibit undefined behavior, effectively creating a denial of service condition. The attack can be executed remotely over the network by an unauthenticated attacker, requiring no special privileges or user interaction.

Root Cause

The root cause of CVE-2020-5360 stems from improper bounds checking within the Dell BSAFE Micro Edition Suite's buffer handling routines. When processing certain inputs, the library fails to properly validate buffer boundaries before performing read operations. This allows read operations to occur at memory addresses preceding the intended buffer location, resulting in access to unintended memory regions.

The lack of proper input validation and boundary checking in the cryptographic processing routines creates conditions where malformed or specially crafted data can trigger the under-read condition, leading to memory corruption issues.

Attack Vector

The vulnerability is exploitable over the network by unauthenticated attackers. The attack requires no user interaction and can be executed with low complexity. An attacker can send specially crafted network requests to applications utilizing the vulnerable Dell BSAFE Micro Edition Suite library.

When the vulnerable library processes the malicious input, it attempts to read memory before the buffer's starting position. This can result in the application accessing invalid memory regions, leading to crashes or unpredictable behavior. The primary impact is availability loss through denial of service, as the affected system or application may become unresponsive or crash entirely.

Due to the nature of buffer under-read vulnerabilities, exploitation typically manifests as application crashes when the software attempts to read from invalid memory addresses, though in some scenarios it may expose sensitive memory contents or cause undefined application states.

Detection Methods for CVE-2020-5360

Indicators of Compromise

• Unexpected application crashes or service restarts in systems using Dell BSAFE Micro Edition Suite or affected Oracle products
• Abnormal memory access errors or segmentation faults in application logs
• Increased frequency of connection failures or timeouts to affected services
• Core dumps or crash reports indicating buffer-related memory access violations

Detection Strategies

• Monitor application and system logs for crash events related to Oracle Database, HTTP Server, Security Service, or WebLogic Server Proxy Plug-In
• Implement intrusion detection rules to identify anomalous traffic patterns targeting services using vulnerable BSAFE libraries
• Use memory protection tools and runtime application self-protection (RASP) solutions to detect out-of-bounds memory access attempts
• Conduct regular vulnerability scanning to identify systems running affected versions of Dell BSAFE or Oracle products

Monitoring Recommendations

• Enable detailed logging on affected Oracle and Dell products to capture crash events and error conditions
• Implement network traffic analysis to identify potential exploitation attempts targeting cryptographic endpoints
• Configure alerting for service availability issues on systems running vulnerable software versions
• Establish baseline behavior for affected applications to detect anomalous activity patterns

How to Mitigate CVE-2020-5360

Immediate Actions Required

• Upgrade Dell BSAFE Micro Edition Suite to version 4.5 or later to address this vulnerability
• Apply Oracle Critical Patch Update from April 2021 for affected Oracle products
• Inventory all systems using Dell BSAFE Micro Edition Suite or affected Oracle products to determine exposure
• Implement network segmentation to limit exposure of vulnerable systems until patches can be applied

Patch Information

Dell has released version 4.5 of the BSAFE Micro Edition Suite which addresses this vulnerability. Organizations should consult the Dell Security Advisory DSA-2020-114 for detailed patching instructions and download links.

For Oracle products that embed the vulnerable Dell BSAFE library, Oracle has addressed this issue in their April 2021 Critical Patch Update. Organizations using affected Oracle Database, HTTP Server, Security Service, or WebLogic Server Proxy Plug-In versions should apply the appropriate patches as detailed in the Oracle Critical Patch Update April 2021.

Workarounds

• Restrict network access to affected services using firewall rules to limit exposure to trusted networks only
• Deploy web application firewalls (WAF) or network-based intrusion prevention systems to filter potentially malicious traffic
• Implement service-level redundancy to maintain availability in case of exploitation-induced crashes
• Consider temporarily disabling non-essential services that rely on vulnerable library versions until patches are applied

# Example: Restrict network access to Oracle HTTP Server using iptables
# Allow connections only from trusted network range
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Verify applied rules
iptables -L -n -v