#windows

yt-dlp is a youtube-dl fork with additional features and fixes. yt-dlp allows the user to provide shell command lines to be executed at various stages in its download steps through the `--exec` flag. This flag allows output template expansion in its argument, so that metadata values may be used in the shell commands. The metadata fields can be combined with the `%q` conversion, which is intended to quote/escape these values so they can be safely passed to the shell. However, the escaping used for `cmd` (the shell used by Python's `subprocess` on Windows) does not properly escape special characters, which can allow for remote code execution if `--exec` is used directly with maliciously crafted remote data. This vulnerability only impacts `yt-dlp` on Windows, and the vulnerability is present regardless of whether `yt-dlp` is run from `cmd` or from `PowerShell`. Support for output template expansion in `--exec`, along with this vulnerable behavior, was added to `yt-dlp` in version 2021.04...

### Impact [`yt-dlp`](https://github.com/yt-dlp/yt-dlp) allows the user to provide shell commands to be executed at various stages in its download process through the `--exec` flag. This flag allows output template expansion in its argument, so that video metadata values may be used in the shell commands. The metadata fields can be combined with the `%q` conversion, which is intended to quote/escape these values so they can be safely passed to the shell. However, the escaping used for `cmd` (the shell used by Python's `subprocess` on Windows) did not properly escape special characters, which can allow for remote code execution if `--exec` is used directly with maliciously crafted remote data. This vulnerability only impacts `yt-dlp` on Windows, and the vulnerability is present regardless of whether `yt-dlp` is run from `cmd` or from `PowerShell`. Support for output template expansion in `--exec`, along with this vulnerable behavior, was added to `yt-dlp` in version [2021.04.11](https...

A heap-based buffer overflow vulnerability exists in the create_png_object functionality of Accusoft ImageGear 20.1. A specially crafted malformed file can lead to memory corruption. An attacker can provide a malicious file to trigger this vulnerability.

A heap-based buffer overflow vulnerability exists in the pictwread functionality of Accusoft ImageGear 20.1. A specially crafted malformed file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.

An out-of-bounds write vulnerability exists in the allocate_buffer_for_jpeg_decoding functionality of Accusoft ImageGear 20.1. A specially crafted malformed file can lead to memory corruption. An attacker can provide a malicious file to trigger this vulnerability.

A stack-based buffer overflow vulnerability exists in the tif_processing_dng_channel_count functionality of Accusoft ImageGear 20.1. A specially crafted malformed file can lead to memory corruption. An attacker can provide a malicious file to trigger this vulnerability.

An out-of-bounds write vulnerability exists in the tiff_planar_adobe functionality of Accusoft ImageGear 20.1. A specially crafted malformed file can lead to memory corruption. An attacker can provide a malicious file to trigger this vulnerability.

A use-after-free vulnerability exists in the tif_parse_sub_IFD functionality of Accusoft ImageGear 20.1. A specially crafted malformed file can lead to arbitrary code execution. An attacker can deliver file to trigger this vulnerability.

A heap-based buffer overflow vulnerability exists in the CreateDIBfromPict functionality of Accusoft ImageGear 20.1. A specially crafted file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.

An out-of-bounds write vulnerability exists in the dcm_pixel_data_decode functionality of Accusoft ImageGear 20.1. A specially crafted malformed file can lead to arbitrary code execution. A victim would need to open a malicious file to trigger this vulnerability.