CVE-2001-1320 in Keyserver
Summary
by MITRE
Network Associates PGP Keyserver 7.0 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via exceptional BER encodings (possibly buffer overflows), as demonstrated by the PROTOS LDAPv3 test suite.
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Analysis
by VulDB Data Team • 04/13/2025
The vulnerability identified as CVE-2001-1320 affects Network Associates PGP Keyserver version 7.0, presenting a critical security flaw that enables remote attackers to trigger system instability and potentially achieve arbitrary code execution. This vulnerability stems from inadequate input validation within the server's handling of BER (Basic Encoding Rules) encoded data, which is commonly used in LDAP (Lightweight Directory Access Protocol) communications. The flaw becomes particularly dangerous when the server processes malformed BER encodings that are part of the PROTOS LDAPv3 test suite, demonstrating how seemingly legitimate protocol testing can be weaponized for malicious purposes.
The technical implementation of this vulnerability involves buffer overflow conditions that occur when the PGP Keyserver processes exceptional BER encodings. These encodings represent a specific format used in ASN.1 (Abstract Syntax Notation One) data structures, which are fundamental to many network protocols including LDAP. When the server encounters malformed BER data, it fails to properly validate the input length and structure, leading to memory corruption that can cause the application to crash or potentially allow an attacker to inject and execute malicious code. This represents a classic buffer overflow vulnerability where the system writes data beyond the allocated memory boundaries, creating opportunities for exploitation.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as the potential for arbitrary code execution places organizations at significant risk of complete system compromise. Remote attackers can exploit this weakness without requiring authentication, making it particularly dangerous for systems that are exposed to untrusted networks or internet-facing services. The vulnerability affects the core functionality of the PGP Keyserver, which serves as a critical component for managing public key infrastructure and cryptographic key distribution within network security frameworks. When exploited successfully, this vulnerability can lead to unauthorized access to sensitive cryptographic materials, disruption of key management services, and potential lateral movement within compromised networks.
Mitigation strategies for CVE-2001-1320 should prioritize immediate patching of the affected PGP Keyserver software to address the buffer overflow conditions in BER encoding handling. Organizations should implement network segmentation to limit exposure of the affected service to trusted networks only, while also deploying intrusion detection systems that can identify suspicious BER encoding patterns in network traffic. The vulnerability aligns with CWE-121, which describes heap-based buffer overflow conditions, and represents a technique that could be mapped to ATT&CK tactic TA0001 (Initial Access) through the use of network-based exploitation. Regular security assessments should include validation of BER encoding handling within all LDAP and ASN.1 dependent services, and system administrators should consider implementing input validation layers that can detect and reject malformed encodings before they reach the vulnerable application components. Additionally, monitoring for unusual system crashes or process restarts in keyserver services can provide early warning indicators of exploitation attempts.