CVE-2007-4407 in ircu
Summary
by MITRE
ircu 2.10.12.03 and 2.10.12.04 does not associate a timestamp with ops privilege on an unused channel (zannel), which allows remote attackers to (1) set or remove certain channel modes via a "netriding" attack or (2) take over a channel by joining an unlinked server with the A/Upass and then setting a new Apass.
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Analysis
by VulDB Data Team • 09/07/2018
The vulnerability described in CVE-2007-4407 affects ircu versions 2.10.12.03 and 2.10.12.04, specifically targeting the channel management subsystem within the Internet Relay Chat protocol implementation. This flaw represents a critical authorization bypass issue that undermines the security model of IRC networks by creating a temporal window where channel operators can be manipulated without proper authentication. The vulnerability stems from the ircu software's failure to properly timestamp operator privileges when channels are unused, creating a scenario where unauthorized parties can exploit this temporal inconsistency to gain control over channels that should be protected by legitimate operator credentials.
The technical implementation of this vulnerability involves the ircu software's handling of zannel channels, which are channels that exist in the network but have no active users or servers linked to them. When a channel becomes unused, the software should maintain proper timestamping of operator privileges to prevent unauthorized access, but this mechanism fails in the affected versions. Attackers can exploit this by performing a "netriding" attack, where they manipulate the network state to gain unauthorized access to channel modes that should only be accessible to legitimate channel operators. This attack vector allows remote adversaries to set or remove specific channel modes without proper authorization, effectively bypassing the normal privilege escalation mechanisms that should protect channel integrity.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it creates persistent security risks for IRC networks that rely on ircu for their infrastructure. The ability to take over channels through a simple join operation with specific passwords demonstrates how this vulnerability can be exploited to completely compromise channel ownership, allowing attackers to modify channel settings, ban users, or even redirect channel traffic to malicious endpoints. This type of attack directly violates the principle of least privilege and can lead to widespread disruption of network services, as compromised channels can be used to spread spam, conduct phishing attacks, or serve as command and control centers for further network infiltration. The vulnerability also enables persistent access to channels that may contain sensitive information or serve as communication hubs for legitimate network operations.
Mitigation strategies for CVE-2007-4407 require immediate software updates to patched versions of ircu that properly implement timestamping for operator privileges on unused channels. Network administrators should also implement additional monitoring of channel operations and privilege changes to detect unauthorized access attempts. The vulnerability aligns with CWE-284, which describes improper access control in software systems, and can be mapped to ATT&CK technique T1078.002 for valid accounts, as it allows attackers to assume operator privileges through legitimate authentication mechanisms. Organizations should also consider implementing network segmentation and access controls to limit the potential impact of such vulnerabilities, as well as maintaining detailed audit logs of channel operations to facilitate forensic analysis in case of compromise. The remediation process must include thorough testing of updated software configurations to ensure that the timestamping mechanisms function correctly and that no additional vulnerabilities have been introduced during the patching process.