CVE-2023-35934 Information

Jul 09, 2023 cve

Description

yt-dlp is a command-line program to download videos from video sites. During file downloads yt-dlp or the external downloaders that yt-dlp employs may leak cookies on HTTP redirects to a different host or leak them when the host for download fragments differs from their parent manifest’s host. This vulnerable behavior is present in yt-dlp prior to 2023.07.06 and nightly 2023.07.06.185519. All native and external downloaders are affected except for curl and httpie (version 3.1.0 or later).

At the file download stage all cookies are passed by yt-dlp to the file downloader as a Cookie header thereby losing their scope. This also occurs in yt-dlp’s info JSON output which may be used by external tools. As a result the downloader or external tool may indiscriminately send cookies with requests to domains or paths for which the cookies are not scoped.

yt-dlp version 2023.07.06 and nightly 2023.07.06.185519 fix this issue by removing the Cookie header upon HTTP redirects; having native downloaders calculate the Cookie header from the cookiejar utilizing external downloaders’ built-in support for cookies instead of passing them as header arguments disabling HTTP redirectiong if the external downloader does not have proper cookie support processing cookies passed as HTTP headers to limit their scope and having a separate field for cookies in the info dict storing more information about scoping

Some workarounds are available for those who are unable to upgrade. Avoid using cookies and user authentication methods. While extractors may set custom cookies these usually do not contain sensitive information. Alternatively avoid using --load-info-json. Or if authentication is a must: verify the integrity of download links from unknown sources in browser (including redirects) before passing them to yt-dlp; use curl as external downloader since it is not impacted; and/or avoid fragmented formats such as HLS/m3u8 DASH/mpd and ISM.

Reference

https://github.com/yt-dlp/yt-dlp-nightly-builds/releases/tag/2023.07.06.185519 https://github.com/yt-dlp/yt-dlp/commit/3121512228487c9c690d3d39bfd2579addf96e07 https://github.com/yt-dlp/yt-dlp/commit/f8b4bcc0a791274223723488bfbfc23ea3276641 https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-v8mc-9377-rwjj https://github.com/yt-dlp/yt-dlp/commit/1ceb657bdd254ad961489e5060f2ccc7d556b729 https://github.com/yt-dlp/yt-dlp/releases/tag/2023.07.06 yt-dlp is a command-line program to download videos from video sites. During file downloads yt-dlp or the external downloaders that yt-dlp employs may leak cookies on HTTP redirects to a different host or leak them when the host for download fragments differs from their parent manifest’s host. This vulnerable behavior is present in yt-dlp prior to 2023.07.06 and nightly 2023.07.06.185519. All native and external downloaders are affected except for curl and [***httpie***](httpie`) (version 3.1.0 or later).

yt-dlp version 2023.07.06 and nightly 2023.07.06.185519 fix this issue by removing the Cookie header upon HTTP redirects; having native downloaders calculate the Cookie header from the cookiejar utilizing external downloaders' built-in support for cookies instead of passing them as header arguments disabling HTTP redirectiong if the external downloader does not have proper cookie support processing cookies passed as HTTP headers to limit their scope and having a separate field for cookies in the info dict storing more information about scoping

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