SB2020112323 - Multiple vulnerabilities in Nextcloud Social app

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Improper access control (CVE-ID: CVE-2020-8278)

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions. A remote attacker can bypass implemented security restrictions and read posts of any user.

2) Improper Certificate Validation (CVE-ID: CVE-2020-8279)

The vulnerability allows a remote attacker to perform a man-in-the-middle (MitM) attack.

The vulnerability exists due to missing validation of server certificates for out-going connections. A remote attacker can perform a MitM attack on the target system.

Remediation

Install update from vendor's website.

References

• https://hackerone.com/reports/921717
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-042
• https://hackerone.com/reports/915585
• https://nextcloud.com/security/advisory/?id=NC-SA-2020-043