SB2020081402 - Multiple vulnerabilities in Quiz And Survey Master – Best Quiz, Exam and Survey Plugin for WordPress

Description

This security bulletin contains information about 2 vulnerabilities.

1) Arbitrary file upload (CVE-ID: N/A)

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:P/U:Amber

The vulnerability allows a remote attacker to compromise vulnerable system.

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

2) Arbitrary File Deletion (CVE-ID: N/A)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

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

The vulnerability allows a remote attacker to delete arbitrary file on the system.

The vulnerability exists due to application does not properly impose security restrictions when "qsm_remove_file_fd_question" function is registered with a regular AJAX action and a "nopriv" AJAX action. A remote attacker can delete important files on the target system.

Remediation

Install update from vendor's website.

References

• https://wpvulndb.com/vulnerabilities/10349/
• https://www.wordfence.com/blog/2020/08/critical-vulnerabilities-patched-in-quiz-and-survey-master-plugin/
• https://www.youtube.com/watch?v=sC4U-oNW34c
• https://www.youtube.com/watch?v=sC4U-oNW34c&feature=emb_logo