Information Exposure Affecting yt-dlp package, versions <2023.07.06-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-ALPINE321-YTDLP-8489950
- published6 Dec 2024
- disclosed6 Jul 2023
Introduced: 6 Jul 2023
CVE-2023-35934 (opens in a new tab)How to fix?
Upgrade Alpine:3.21 yt-dlp to version 2023.07.06-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream yt-dlp package and not the yt-dlp package as distributed by Alpine.
See How to fix? for Alpine:3.21 relevant fixed versions and status.
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.
References
- https://github.com/yt-dlp/yt-dlp-nightly-builds/releases/tag/2023.07.06.185519
- https://github.com/yt-dlp/yt-dlp/commit/1ceb657bdd254ad961489e5060f2ccc7d556b729
- 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/releases/tag/2023.07.06
- https://github.com/yt-dlp/yt-dlp/security/advisories/GHSA-v8mc-9377-rwjj
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5X6YT6AQE5FHM5VTQLKKJXSYBLLJF26W/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HEOKCGVONGHR2SYUIXU33A4MKXZBDP6L/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IM44RJL2MR2WG3ZY354C5IUEEZUJGEVA/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/M7E7CQ5S5KMZHAMCNU7V7KYNBVCPLBHG/