SB2018122110 - Privilege escalation in Keybase
Published: December 21, 2018
Security Bulletin ID
SB2018122110
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
2
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 2 vulnerabilities.
1) Privilege escalation (CVE-ID: N/A)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local attacker to gain elevated privileges on the target system.
The weakness exists due to insufficient permission checking by the Keybase Helper process. A local attacker can gain elevated privileges to upgrade the FUSE kext and load it on machine startup.
2) Privilege escalation (CVE-ID: CVE-2018-18629)
CWE-ID: CWE-426 - Untrusted Search Path
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local attacker to gain elevated privileges on the target system.
The weakness exists due to in the Keybase command-line client untrusted search path in the keybase-redirector application. A local unprivileged attacker can gain root privileges via a Trojan horse binary.
Remediation
Install update from vendor's website.