CVE-2013-0342 in pyrad
Summary
by MITRE
The CreateID function in packet.py in pyrad before 2.1 uses sequential packet IDs, which makes it easier for remote attackers to spoof packets by predicting the next ID, a different vulnerability than CVE-2013-0294.
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Analysis
by VulDB Data Team • 03/09/2024
The vulnerability identified as CVE-2013-0342 affects the pyrad library version 2.1 and earlier, specifically within the packet.py module where the CreateID function generates packet identifiers. This flaw represents a significant security weakness that undermines the integrity of network authentication protocols relying on this library. The vulnerability stems from the predictable nature of packet ID generation, where sequential numbering is employed instead of cryptographically secure randomization. This design choice creates a scenario where malicious actors can easily anticipate future packet identifiers, enabling them to forge authentication packets with minimal effort.
The technical implementation of this vulnerability resides in the packet identification mechanism of the pyrad library, which is commonly used for implementing remote authentication dial-in user service protocols. When the CreateID function generates sequential packet IDs, it fails to incorporate sufficient entropy or randomness into the generation process. This predictable pattern allows attackers to monitor legitimate packet flows and subsequently predict the next packet identifier that will be generated. The vulnerability operates at the protocol level, specifically targeting the authentication packet structure where ID sequences are used to track and correlate communication sessions.
The operational impact of CVE-2013-0342 extends beyond simple packet spoofing capabilities, as it fundamentally compromises the security model of authentication systems using pyrad. An attacker who successfully predicts packet IDs can manipulate authentication exchanges, potentially gaining unauthorized access to network resources or disrupting legitimate authentication processes. This vulnerability is particularly dangerous in environments where network authentication is critical, such as enterprise networks, wireless access points, or any system relying on RADIUS protocol implementations. The ability to predict packet IDs creates a pathway for man-in-the-middle attacks and session hijacking scenarios that could lead to complete system compromise.
The vulnerability maps to CWE-338, which addresses the use of cryptographically weak random number generators, and aligns with ATT&CK techniques related to credential access and network protocol manipulation. Organizations using pyrad versions prior to 2.1 should immediately implement mitigation strategies including upgrading to patched versions of the library, implementing additional authentication layers, or deploying network monitoring solutions to detect anomalous packet ID patterns. The remediation process involves ensuring that packet ID generation employs cryptographically secure random number generation methods, eliminating the sequential predictability that enables this attack vector. Network administrators should also consider implementing intrusion detection systems that can identify suspicious packet ID sequences and alert security teams to potential exploitation attempts.