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CVE-2024-47174— Credential leak when credentials are used with `<nix/fetchurl.nix>`

Quick assessment

Affected
NixOS nix
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.

Nix是Nix开源的一个强大的包管理器。用于制作包。 Nix 1.11版本到2.24.8版本之前存在授权问题漏洞，该漏洞源于nix/fetchurl.nix不会验证HTTPS请求上的TLS证书，导致容易受到中间人攻击。

CVSS 5.9 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1113 · Screen Capture
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I. Basic Information for CVE-2024-47174

Vulnerability Information
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Vulnerability Title
Credential leak when credentials are used with `<nix/fetchurl.nix>`
Source: CVE Program / CVE List V5
Vulnerability Description
Nix is a package manager for Linux and other Unix systems. Starting in version 1.11 and prior to versions 2.18.8 and 2.24.8, `<nix/fetchurl.nix>` did not verify TLS certificates on HTTPS connections. This could lead to connection details such as full URLs or credentials leaking in case of a man-in-the-middle (MITM) attack. `<nix/fetchurl.nix>` is also known as the builtin derivation builder `builtin:fetchurl`. It's not to be confused with the evaluation-time function `builtins.fetchurl`, which was not affected by this issue. A user may be affected by the risk of leaking credentials if they have a `netrc` file for authentication, or rely on derivations with `impureEnvVars` set to use credentials from the environment. In addition, the commonplace trust-on-first-use (TOFU) technique of updating dependencies by specifying an invalid hash and obtaining it from a remote store was also vulnerable to a MITM injecting arbitrary store objects. This also applied to the impure derivations experimental feature. Note that this may also happen when using Nixpkgs fetchers to obtain new hashes when not using the fake hash method, although that mechanism is not implemented in Nix itself but rather in Nixpkgs using a fixed-output derivation. The behavior was introduced in version 1.11 to make it consistent with the Nixpkgs `pkgs.fetchurl` and to make `<nix/fetchurl.nix>` work in the derivation builder sandbox, which back then did not have access to the CA bundles by default. Nowadays, CA bundles are bind-mounted on Linux. This issue has been fixed in Nix 2.18.8 and 2.24.8. As a workaround, implement (authenticated) fetching with `pkgs.fetchurl` from Nixpkgs, using `impureEnvVars` and `curlOpts` as needed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Nix 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nix是Nix开源的一个强大的包管理器。用于制作包。 Nix 1.11版本到2.24.8版本之前存在授权问题漏洞，该漏洞源于nix/fetchurl.nix不会验证HTTPS请求上的TLS证书，导致容易受到中间人攻击。
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
NixOS nix >= 1.11, < 2.18.8 -

II. Public POCs for CVE-2024-47174

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III. Intelligence Information for CVE-2024-47174

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Patches & Fixes for CVE-2024-47174 (3)

Vendor Advisories for CVE-2024-47174 (1)

IV. Related Vulnerabilities

Same product: nix
Same vendor: NixOS
Same weakness: CWE-287

V. Comments for CVE-2024-47174

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