Privilege escalation in Keybase

1) Privilege escalation

EUVDB-ID: #VU17365

Risk: Low

CVSSv4.0: 5.9 [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/E:U/U:Clear]

CVE-ID: CVE-2019-7249

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

Exploit availability: No

Description

The vulnerability allows a local attacker to escalate privileges on the system.

The vulnerability exists due to a time-to-check-time-to-use flaw. A local attacker can gain elevated privileges and tamper with another's installs.

Mitigation

Update to version 2.13.

Vulnerable software versions

Keybase: 2.0.0 - 2.11.0

CPE2.3

• cpe:2.3:a:keybase:keybase:2.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:keybase:keybase:2.1.0:*:*:*:*:*:*:*
• cpe:2.3:a:keybase:keybase:2.1.1:*:*:*:*:*:*:*

External links

https://hackerone.com/reports/471739
https://keybase.io/docs/secadv/kb004

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to perform certain actions on the device.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.