SB2020020507 - Privilege escalation in MariaDB

Description

This security bulletin contains information about 1 vulnerability.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-7221)

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

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:Amber

The vulnerability allows a remote user to escalate privileges on the system.

The vulnerability exists in the "mysql_install_db" script due to "chown" and "chmod" are performed unsafely, as demonstrated by a symlink attack on a chmod 04755 of auth_pam_tool_dir/auth_pam_tool. A remote user can gain root privileges on the target system.

Note: This vulnerability does not affect the Oracle MySQL product, which implements mysql_install_db differently.

Remediation

Install update from vendor's website.

References

• https://bugzilla.suse.com/show_bug.cgi?id=1160868
• https://github.com/MariaDB/server/commit/9d18b6246755472c8324bf3e20e234e08ac45618
• https://seclists.org/oss-sec/2020/q1/55