Arbitrary file write is possible in Pandoc when using PDF output or --extract-media with untrusted input
概要
Arbitrary file write is possible in Pandoc when using PDF output or --extract-media with untrusted input
原文の説明
取得元が公開している説明をそのまま載せています (多くは英語)。
Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. Starting in version 1.13 and prior to version 3.1.4, Pandoc is susceptible to an arbitrary file write vulnerability, which can be triggered by providing a specially crafted image element in the input when generating files using the --extract-media option or outputting to PDF format. This vulnerability allows an attacker to create or overwrite arbitrary files on the system ,depending on the privileges of the process running pandoc. It only affects systems that pass untrusted user input to pandoc and allow pandoc to be used to produce a PDF or with the --extract-media option.
The fix is to unescape the percent-encoding prior to checking that the resource is not above the working directory, and prior to extracting the extension. Some code for checking that the path is below the working directory was flawed in a similar way and has also been fixed. Note that the --sandbox option, which only affects IO done by readers and writers themselves, does not block this vulnerability. The vulnerability is patched in pandoc 3.1.4. As a workaround, audit the pandoc command and disallow PDF output and the --extract-media option.
出典: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
ディストリビューション別の修正状況
各ディストリビューションが公開している、この CVE の修正パッケージ
- Debian DEBIAN-CVE-2023-35936 haskell-pandoc 修正版: 3.0.1-2
- Ubuntu UBUNTU-CVE-2023-35936 pandoc
参照URL
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- web lists.debian.org
- web lists.fedoraproject.org
- web lists.fedoraproject.org
- web lists.fedoraproject.org