SB2020081034 - Multiple vulnerabilities in Nextcloud Desktop Client

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Main Vulnerability Database SB2020081034

SB2020081034 - Multiple vulnerabilities in Nextcloud Desktop Client

Published: August 10, 2020 Updated: September 15, 2020

Security Bulletin ID SB2020081034
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

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

Description

This security bulletin contains information about 4 vulnerabilities.


1) Code Injection (CVE-ID: CVE-2020-8224)

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

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


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

The vulnerability exists due to improper input validation when processing OpenSSL configuration file. A remote user can upload a malicious OpenSSL config file into a fixed directory and execute arbitrary code on the system.



2) Protection mechanism failure (CVE-ID: CVE-2020-8230)

CWE-ID: CWE-693 - Protection Mechanism Failure

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


The vulnerability allows an attacker to leverage absence of security measures.

The vulnerability exists due to application does not implement ASLR and DEP protection mechanisms. A remote attacker can leverage from absence of such feature to facilitate exploitation of other vulnerabilities in the application.


3) Memory leak (CVE-ID: CVE-2020-8229)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

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


The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to memory leak within the OCUtil.dll library used by Nextcloud Desktop Client. A local user can perform a denial of service attack.


4) Cleartext storage of sensitive information (CVE-ID: CVE-2020-8225)

CWE-ID: CWE-312 - Cleartext Storage of Sensitive Information

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


The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to software stores in clear text information about used proxies and their authentication credentials. A local user can read the log files and gain access to sensitive information.


Remediation

Install update from vendor's website.

References