CVE-2016-10188 in bitlbee-libpurple
Summary
by MITRE
Use-after-free vulnerability in bitlbee-libpurple before 3.5 allows remote servers to cause a denial of service (crash) or possibly execute arbitrary code by causing a file transfer connection to expire.
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Analysis
by VulDB Data Team • 03/15/2017
The vulnerability identified as CVE-2016-10188 represents a critical use-after-free flaw within the bitlbee-libpurple library version 3.4 and earlier. This vulnerability specifically manifests when processing file transfer connections that expire, creating a scenario where remote servers can manipulate the application's memory management behavior. The issue stems from improper handling of memory resources after they have been freed, allowing malicious actors to potentially trigger undefined behavior through crafted file transfer operations.
This vulnerability operates at the intersection of memory safety and network protocol handling within instant messaging applications. When a file transfer connection expires, the system attempts to clean up associated memory structures, but fails to properly validate the state of these resources before subsequent operations. The flaw allows attackers to control the timing and nature of memory deallocation, potentially leading to either application crashes or more severe exploitation opportunities. The vulnerability is particularly concerning because it can be triggered remotely without requiring authentication, making it accessible to any network entity capable of establishing communication with the affected system.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as the use-after-free condition creates opportunities for arbitrary code execution. When the application attempts to access memory that has already been freed, it may follow invalid memory pointers or corrupt memory structures, potentially allowing attackers to inject and execute malicious code within the application's process context. This represents a significant risk in environments where bitlbee-libpurple serves as a gateway for multiple communication protocols, as the compromise of a single instance could potentially affect broader network communications or serve as a foothold for further attacks.
From a cybersecurity perspective, this vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions in memory management. The ATT&CK framework categorizes this as a memory corruption vulnerability that could be leveraged for privilege escalation or code execution within the target system. The remote exploitability aspect means that defenders must consider network-level mitigations and ensure proper patch management protocols are in place to address this class of vulnerability. Organizations should implement network segmentation and monitoring to detect unusual file transfer patterns that might indicate exploitation attempts. The vulnerability underscores the importance of regular security updates and proper memory management practices in networked applications, particularly those handling real-time communications and file transfers.
Mitigation strategies should include immediate patching to version 3.5 or later of the bitlbee-libpurple library, along with network monitoring to detect anomalous file transfer behaviors. System administrators should also implement proper input validation and resource management practices within the affected applications. The vulnerability demonstrates the critical need for thorough memory safety testing in communication protocols and the importance of maintaining up-to-date security patches across all network services. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other components of the communication infrastructure.