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CVE-2018-12633 is a double-fetch race condition in the Linux kernel (through 4.17.2) within the vbg_misc_device_ioctl() function in drivers/virt/vboxguest/vboxguest_linux.c. The function reads user-supplied data twice using copy_from_user, allowing a malicious local user to modify critical header variables (hdr.size_in and hdr.size_out) between the two reads. This can result in buffer over-accesses, leading to kernel errors, information leakage, or denial of service.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a working exploit for CVE-2018-12633, an authentication bypass vulnerability in the TP-Link TL-WR840N router (firmware circa June 2018). The exploit consists of two main scripts: 1. 'exploit.sh' (Bash): Automates the exploitation process by sending a crafted HTTP request to the router's configuration file endpoint ('/userRpm/Romfile.cfg') with a spoofed Referer header ('/mainFrame.htm'). If successful, it downloads the encrypted configuration file without requiring authentication. 2. 'decrypt_conf.py' (Python): Decrypts the downloaded configuration file using a hardcoded DES key, allowing the attacker to recover sensitive information such as admin credentials, PPPoE details, and Wi-Fi keys. The repository also includes a detailed README.md with technical analysis, exploitation steps, and mitigation advice. The exploit is operational and demonstrates a real-world attack chain, but requires the target device to be running vulnerable firmware and accessible on the network. No fake or detection-only scripts are present; the code is a functional exploit and post-exploitation tool.
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