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CVE-2024-32477— Race condition when flushing input stream leads to permission prompt bypass

Quick assessment

Affected
denoland deno
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Deno是开源的一个简单、现代且安全的JavaScript和 TypeScript运行环境。它使用 V8 并使用 Rust 构建。 Deno 1.42.2之前版本存在安全漏洞，该漏洞源于 ANSI 转义序列与读取标准输入之间存在竞争条件，导致权限提示绕过。

CVSS 7.7 · High EPSS 0.34% · P25
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I. Basic Information for CVE-2024-32477

Vulnerability Information
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Vulnerability Title
Race condition when flushing input stream leads to permission prompt bypass
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Deno 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deno是开源的一个简单、现代且安全的JavaScript和 TypeScript运行环境。它使用 V8 并使用 Rust 构建。 Deno 1.42.2之前版本存在安全漏洞，该漏洞源于 ANSI 转义序列与读取标准输入之间存在竞争条件，导致权限提示绕过。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
denoland deno < 1.42.2 -

II. Public POCs for CVE-2024-32477

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III. Intelligence Information for CVE-2024-32477

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Vendor Advisories for CVE-2024-32477 (1)

IV. Related Vulnerabilities

Same product: deno
Same vendor: denoland
Same weakness: CWE-78

V. Comments for CVE-2024-32477

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