What is the CVSS score of CVE-2023-35936?

CVE-2023-35936 has a CVSS 3.1 base score of 5.0 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L. EPSS exploitation probability: 0.4%.

Is there a public PoC exploit available for CVE-2023-35936?

Yes, a public proof-of-concept exploit is available for CVE-2023-35936. Prioritise patching immediately. EPSS: 0.4%.

Debian Linux CVE-2023-35936

MEDIUM

Improper Input Validation (CWE-20)

2023-07-05 security-advisories@github.com

RCE Debian Debian Linux Pandoc

5.0

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.0 MEDIUM

AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

Low

Lifecycle Timeline

CVE Published

Jul 05, 2023 - 21:15 nvd

MEDIUM 5.0

DescriptionNVD

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.

AnalysisAI

Pandoc is a Haskell library for converting from one markup format to another, and a command-line tool that uses this library. Rated medium severity (CVSS 5.0). Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-20. 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. Affected products include: Pandoc, Debian Debian Linux. Version information: version 1.13.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.