PT-2019-12910 · Nextcloud · Nextcloud Extract Add-On

Published 2019-06-05 · Updated 2019-06-06 · CVE-2019-12739

Positive Technologies (AI Summary)

CVSS v3.1

9.0

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Nextcloud Extract add-on versions prior to 1.2.0

Description The issue allows for remote code execution via shell metacharacters in a RAR filename. This is achieved through the ajax/extractRar.php endpoint, specifically using the nameOfFile and directory parameters.

Recommendations For versions prior to 1.2.0, update to version 1.2.0 or later to resolve the issue. As a temporary workaround, consider restricting access to the ajax/extractRar.php endpoint until the update is applied. Avoid using the nameOfFile and directory parameters in the affected endpoint until the issue is resolved.

Exploit

Fix

OS Command Injection

Weakness Enumeration

CWE-78

Related Identifiers

CVE-2019-12739

Affected Products

Nextcloud Extract Add-On

References · 4

• 🔥 https://hackerone.com/reports/546753 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2019-12739 · Security Note
• https://osv.dev/vulnerability/CVE-2019-12739 · Vendor Advisory
• https://secsignal.org/news/a-tale-of-rce-nextcloud-extract-app · Note