| Name | CVE-2023-35936 |
| Description | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3507-1 |
| Debian Bugs | 1041976 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| haskell-pandoc (PTS) | sid, trixie | 3.1.3-2 | fixed |
| pandoc (PTS) | buster | 2.2.1-3 | vulnerable |
| buster (security) | 2.2.1-3+deb10u1 | fixed | |
| bullseye | 2.9.2.1-1+deb11u1 | fixed | |
| bookworm | 2.17.1.1-2~deb12u1 | fixed | |
| sid, trixie | 3.1.3+ds-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| haskell-pandoc | source | (unstable) | 3.0.1-2 | |||
| pandoc | source | buster | 2.2.1-3+deb10u1 | DLA-3507-1 | ||
| pandoc | source | bullseye | 2.9.2.1-1+deb11u1 | |||
| pandoc | source | bookworm | 2.17.1.1-2~deb12u1 | |||
| pandoc | source | (unstable) | 2.17.1.1-2 | 1041976 |
https://github.com/jgm/pandoc/security/advisories/GHSA-xj5q-fv23-575g
Fixed by: https://github.com/jgm/pandoc/commit/5e381e3878b5da87ee7542f7e51c3c1a7fd84b89 (3.1.4)
Regression: https://github.com/jgm/pandoc/commit/54561e9a6667b36a8452b01d2def9e3642013dd6 (3.1.4)
Regression: https://github.com/jgm/pandoc/commit/df4f13b262f7be5863042f8a5a1c365282c81f07 (3.1.4)
Tests: https://github.com/jgm/pandoc/commit/fe62da61dfd33e6b4c0c03895c528a47a0405bf7
Tests: https://github.com/jgm/pandoc/commit/5246f02f0bb9c176a6d2f6e3d0c03407d8a67445
Followup (to avoid introduction of CVE-2023-38745):
https://github.com/jgm/pandoc/commit/eddedbfc14916aa06fc01ff04b38aeb30ae2e625 (3.1.6)