Improper Input Validation Affecting pandoc package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.1% (25th percentile)

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  • Snyk IDSNYK-RHEL8-PANDOC-5808589
  • published28 Jul 2023
  • disclosed6 Jul 2023

Introduced: 6 Jul 2023

CVE-2023-35936  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 pandoc.

NVD Description

Note: Versions mentioned in the description apply only to the upstream pandoc package and not the pandoc package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1