CVE-2013-6483 in Pidgin
Summary
by MITRE
The XMPP protocol plugin in libpurple in Pidgin before 2.10.8 does not properly determine whether the from address in an iq reply is consistent with the to address in an iq request, which allows remote attackers to spoof iq traffic or cause a denial of service (NULL pointer dereference and application crash) via a crafted reply.
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Analysis
by VulDB Data Team • 06/08/2021
The vulnerability identified as CVE-2013-6483 represents a critical security flaw in the XMPP protocol implementation within Pidgin's libpurple library, affecting versions prior to 2.10.8. This issue stems from inadequate validation of message routing semantics within the Extensible Messaging and Presence Protocol communication framework, where the system fails to properly verify the consistency between source and destination addresses in iq (info/query) packets. The flaw specifically manifests in the protocol plugin's handling of iq replies, creating a scenario where malicious actors can exploit the absence of proper address validation mechanisms to manipulate communication flows.
The technical implementation of this vulnerability resides in the lack of proper address consistency checking between iq request and reply messages, which directly corresponds to CWE-284 access control weaknesses and CWE-129 input validation errors. When a crafted iq reply is received with a from address that does not match the expected to address from the original request, the system fails to validate this inconsistency properly. This validation failure creates multiple attack vectors including spoofing capabilities where attackers can masquerade as legitimate users or systems, and denial of service conditions that can trigger NULL pointer dereference exceptions leading to application crashes and service interruptions.
From an operational perspective, this vulnerability exposes Pidgin users to significant risks in environments where XMPP-based instant messaging is utilized, particularly in enterprise settings, collaborative platforms, and communication systems relying on the libpurple library. The impact extends beyond simple service disruption to potential information disclosure and authentication bypass scenarios, as attackers can exploit the spoofing capability to intercept or manipulate communications between users. The vulnerability affects the fundamental integrity of the communication channel, undermining trust in the messaging system and potentially enabling further attacks through the compromised communication pathways.
Mitigation strategies for CVE-2013-6483 should prioritize immediate patch deployment to Pidgin versions 2.10.8 and later, which contain the necessary address validation fixes. Organizations should also implement network-level monitoring to detect anomalous iq traffic patterns and establish proper input sanitization procedures for all XMPP protocol communications. The fix addresses the underlying issue by implementing strict validation of from and to address consistency in iq message handling, aligning with ATT&CK technique T1071.004 for application layer protocol manipulation. Additionally, system administrators should consider implementing rate limiting and connection monitoring to prevent exploitation attempts and maintain service availability during the remediation process.