CVE-2024-32477: Race condition when flushing input stream leads to permission prompt bypass
Deno is a JavaScript, TypeScript, and WebAssembly runtime with secure defaults. By using ANSI escape sequences and a race between libc::tcflush(0, libc::TCIFLUSH) and reading standard input, it's possible to manipulate the permission prompt and force it to allow an unsafe action regardless of the user input. Some ANSI escape sequences act as a info request to the master terminal emulator and the terminal emulator sends back the reply in the PTY channel. standard streams also use this channel to send and get data. For example the \033[6n sequence requests the current cursor position. These sequences allow us to append data to the standard input of Deno. This vulnerability allows an attacker to bypass Deno permission policy. This vulnerability is fixed in 1.42.2.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2024-32477?
CVE-2024-32477 is classified as a high-severity vulnerability due to its ability to manipulate permission prompts.
How do I fix CVE-2024-32477?
To mitigate CVE-2024-32477, update Deno to version 1.42.2 or later immediately.
What versions of Deno are affected by CVE-2024-32477?
CVE-2024-32477 affects Deno versions prior to 1.42.2.
What type of attack does CVE-2024-32477 describe?
CVE-2024-32477 describes a race condition attack involving ANSI escape sequences that can lead to unauthorized action permission escalation.
Is user input safe to use with Deno versions affected by CVE-2024-32477?
User input can be unsafe with affected Deno versions due to potential exploitation of CVE-2024-32477.