CVE-2022-45909 in drachtio-server
Summary
by MITRE • 11/26/2022
drachtio-server 0.8.18 has a heap-based buffer over-read via a long Request-URI in an INVITE request.
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Analysis
by VulDB Data Team • 04/26/2025
The vulnerability identified as CVE-2022-45909 affects drachtio-server version 0.8.18 and represents a heap-based buffer over-read condition that occurs when processing INVITE requests containing excessively long Request-URI values. This issue resides within the session initiation protocol handling mechanisms of the telephony server software, specifically during the parsing of SIP INVITE messages where the server fails to properly validate the length of the Request-URI field before attempting to process it. The flaw manifests when an attacker crafts a malicious SIP INVITE message with an abnormally long Request-URI that exceeds the allocated buffer space, causing the application to read beyond its intended memory boundaries.
The technical implementation of this vulnerability stems from inadequate input validation and memory management practices within the drachtio-server's SIP message processing pipeline. When the server receives an INVITE request with an oversized Request-URI, the parsing routine attempts to copy or process this data without proper bounds checking, leading to memory corruption that can result in application instability, unexpected behavior, or potential exploitation. This type of buffer over-read vulnerability falls under the common weakness enumeration CWE-125, which specifically addresses out-of-bounds read conditions in software implementations. The vulnerability is particularly concerning in telephony environments where SIP servers handle numerous concurrent connections and requests, as the over-read could potentially be leveraged to disclose sensitive memory contents or cause denial of service conditions.
The operational impact of CVE-2022-45909 extends beyond simple service disruption to potentially enable more sophisticated attacks within the telecommunications infrastructure. An attacker exploiting this vulnerability could cause the drachtio-server process to crash or behave unpredictably, leading to service interruptions for legitimate users and potentially creating opportunities for further exploitation. In environments where drachtio-server is used as a core component of SIP-based communication systems, such as PBX systems, VoIP gateways, or telephony application servers, the vulnerability could be leveraged to disrupt critical communication services. The over-read condition may also expose memory layout information that could aid in developing more advanced exploitation techniques, making this vulnerability particularly dangerous in targeted attack scenarios.
Mitigation strategies for CVE-2022-45909 should focus on immediate patching of the affected drachtio-server version to the latest available release that contains the necessary memory validation fixes. Organizations should implement network-level controls such as SIP message filtering and rate limiting to reduce the impact of potential exploitation attempts. The implementation of input validation mechanisms that enforce reasonable limits on Request-URI length can serve as a defensive measure while awaiting official patches. Additionally, monitoring systems should be configured to detect unusual SIP traffic patterns that might indicate exploitation attempts, and intrusion detection systems should be updated to recognize signatures associated with this specific vulnerability. From an ATT&CK framework perspective, this vulnerability relates to T1071.004 for application layer protocol and T1499.004 for network disruption, as it enables both service disruption and potentially information disclosure through memory corruption. Organizations should also consider implementing network segmentation to limit the potential impact of successful exploitation and maintain comprehensive incident response procedures for handling such vulnerabilities in critical telecommunications infrastructure.