SB2021010601 - Multiple vulnerabilities in Gotenberg

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Main Vulnerability Database SB2021010601

SB2021010601 - Multiple vulnerabilities in Gotenberg

Published: January 6, 2021

Security Bulletin ID SB2021010601
CSH Severity
High
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 75% Medium 25%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Template Injection (CVE-ID: CVE-2020-13449)

CWE-ID: CWE-94 - Improper Control of Generation of Code ('Code Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/U:Green


The vulnerability allows a remote attacker to read contents of arbitrary files on the system.

The vulnerability exists due to improper input validation when converting data into PDF format via "/convert/markdown" URL. A remote attacker can pass specially crafted file and read contents of arbitrary files on the system via PDF output.



2) Arbitrary file upload (CVE-ID: CVE-2020-13450)

CWE-ID: CWE-434 - Unrestricted Upload of File with Dangerous Type

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to insufficient validation of file during file upload at the "/convert/markdown" URL. A remote attacker can upload a malicious file and execute it on the server.


3) Incomplete cleanup (CVE-ID: CVE-2020-13451)

CWE-ID: CWE-459 - Incomplete cleanup

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to software does not remove temporary files created during previous file uploads. A remote attacker can upload a specially crafted file that will overwrite libreoffice config (profile) files and execute arbitrary code on the system using libreoffice macros.


4) Incorrect default permissions (CVE-ID: CVE-2020-13452)

CWE-ID: CWE-276 - Incorrect Default Permissions

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code on the system.

The vulnerability exists due to incorrect default permissions for the "/tini" file, which is writable by default by the gotenberg user. A remote attacker can overwrite the file using vulnerability #VU49284 and perform a denial of service attack or execute arbitrary code on the system.


Remediation

Install update from vendor's website.

References