CVE-2023-38632 in async-sockets-cpp
Summary
by MITRE • 07/21/2023
async-sockets-cpp through 0.3.1 has a stack-based buffer overflow in tcpsocket.hpp when processing malformed TCP packets.
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Analysis
by VulDB Data Team • 07/21/2023
The vulnerability identified as CVE-2023-38632 resides within the async-sockets-cpp library version 0.3.1 and earlier, representing a critical stack-based buffer overflow condition that manifests during the processing of malformed TCP packets. This library serves as a C++ implementation for asynchronous socket operations and is commonly utilized in network applications requiring high-performance TCP communication. The flaw specifically occurs in the tcpsocket.hpp component which handles TCP socket operations and packet processing. When the library encounters malformed TCP packets that exceed expected buffer boundaries, the application fails to properly validate packet lengths or contents before copying data into fixed-size stack buffers, creating an exploitable condition that could allow attackers to overwrite adjacent stack memory regions.
The technical implementation of this vulnerability stems from improper input validation mechanisms within the TCP packet processing pipeline. The stack-based buffer overflow occurs because the library does not adequately check the length of incoming TCP packet data against predetermined buffer sizes before performing memory copy operations. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a fundamental memory safety issue where data written to a buffer exceeds the buffer's allocated size. The flaw is particularly dangerous because TCP packets can be crafted to contain oversized payload data that, when processed by the vulnerable library, triggers the buffer overflow condition. The stack memory corruption can potentially overwrite return addresses, function pointers, or other critical control data structures, enabling arbitrary code execution or application crashes.
From an operational perspective, this vulnerability poses significant risks to applications that rely on the async-sockets-cpp library for network communications. Systems utilizing this library in production environments may become vulnerable to remote code execution attacks if attackers can craft and inject malformed TCP packets into the network traffic. The impact extends beyond simple application crashes to potentially allow full system compromise, especially when the affected applications run with elevated privileges or handle sensitive data. The vulnerability is particularly concerning in network infrastructure applications, web servers, or any service that processes untrusted network input through the vulnerable library. Attackers could exploit this weakness to execute malicious code on target systems, establish persistent backdoors, or perform denial-of-service attacks that disrupt legitimate network services. The exploitability of this condition is heightened because TCP packet manipulation is relatively straightforward and network traffic is often unfiltered at the application level.
Mitigation strategies for CVE-2023-38632 should prioritize immediate patching of the async-sockets-cpp library to version 0.3.2 or later, which contains the necessary buffer overflow protections and input validation improvements. Organizations should conduct comprehensive vulnerability assessments to identify all systems and applications that utilize this library, particularly those handling untrusted network input or operating in environments with hostile network conditions. Network segmentation and filtering should be implemented to reduce exposure by limiting access to affected services and monitoring for anomalous TCP packet patterns that might indicate exploitation attempts. Additionally, implementing address space layout randomization and stack canaries can provide additional defense-in-depth measures that make exploitation more difficult. The remediation approach should also include code reviews and static analysis of applications using this library to ensure proper error handling and input validation practices are implemented throughout the application stack. Security monitoring should be enhanced to detect unusual network traffic patterns or application behavior that might indicate exploitation attempts, with particular attention to any unexplained application crashes or memory corruption symptoms that align with buffer overflow characteristics.