CVE-2010-1324 in Kerberos
Summary
by MITRE
MIT Kerberos 5 (aka krb5) 1.7.x and 1.8.x through 1.8.3 does not properly determine the acceptability of checksums, which might allow remote attackers to forge GSS tokens, gain privileges, or have unspecified other impact via (1) an unkeyed checksum, (2) an unkeyed PAC checksum, or (3) a KrbFastArmoredReq checksum based on an RC4 key.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 10/06/2021
The vulnerability identified as CVE-2010-1324 affects MIT Kerberos 5 versions 1.7.x and 1.8.x through 1.8.3, representing a critical weakness in the cryptographic integrity verification mechanism of the Kerberos authentication protocol. This flaw resides in the improper determination of checksum acceptability, which fundamentally undermines the security assurances that Kerberos provides for network authentication. The vulnerability specifically targets the validation process of various checksum types including unkeyed checksums, unkeyed PAC checksums, and KrbFastArmoredReq checksums that utilize RC4 keys, creating multiple attack vectors for malicious actors seeking to compromise authentication systems.
The technical root cause of this vulnerability stems from insufficient validation of checksum parameters during the Kerberos authentication process, particularly when processing GSS tokens. According to CWE-310, this represents a cryptographic weakness where the system fails to properly verify the integrity of authentication data. The flaw allows attackers to exploit the lack of proper checksum validation by crafting forged authentication tokens that appear legitimate to the Kerberos server. When the system accepts these improperly validated checksums, it creates opportunities for privilege escalation and unauthorized access to protected resources. The vulnerability is particularly dangerous because it affects multiple checksum types, each representing different attack surfaces within the Kerberos ecosystem.
Operationally, this vulnerability presents significant risks to organizations relying on Kerberos for authentication, as it enables remote attackers to bypass authentication mechanisms entirely. The impact extends beyond simple unauthorized access to include potential privilege escalation and complete compromise of the authentication infrastructure. Attackers can leverage this vulnerability to forge authentication tokens that would otherwise be rejected by proper checksum validation, effectively allowing them to impersonate legitimate users or services within the Kerberos realm. The unspecified nature of the other impacts suggests potential for additional security consequences beyond the immediate authentication bypass, potentially including data exfiltration or further compromise of the network infrastructure.
Mitigation strategies for CVE-2010-1324 require immediate patching of affected Kerberos installations to the latest available versions that address the checksum validation flaw. Organizations should also implement network monitoring to detect unusual authentication patterns that might indicate exploitation attempts. The remediation process should include thorough testing of patched systems to ensure that legitimate authentication operations continue to function properly while the vulnerability is addressed. Additionally, system administrators should consider implementing additional security controls such as network segmentation and access controls to limit the potential impact of successful exploitation attempts. According to ATT&CK framework, this vulnerability maps to privilege escalation and defense evasion techniques, making comprehensive monitoring and response procedures essential for organizations that have not yet patched their systems.