Privilege escalation in gpsd and microjson

1) Stack-based buffer overflow

EUVDB-ID: #VU17714

Risk: Medium

CVSSv4.0: 5.2 [CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-17937

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

The vulnerability allows an adjacent attacker to gain elevated privileges on the target system.

The vulnerability exists due to a boundary error when handling malicious input. An adjacent attacker can trigger stack-based buffer overflow and execute arbitrary code via traffic on Port 2947/TCP or crafted JSON inputs.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Update gpsd to version 3.18 or later.
Update microjson to version 1.4.

Vulnerable software versions

gpsd: 2.90 - 3.17

microjson: 1.0 - 1.3

CPE2.3

• cpe:2.3:a:eric_s._raymond:gpsd:2.90:*:*:*:*:*:*:*
• cpe:2.3:a:eric_s._raymond:gpsd:3.0:*:*:*:*:*:*:*
• cpe:2.3:a:eric_s._raymond:gpsd:3.1:*:*:*:*:*:*:*
• cpe:2.3:a:eric_s._raymond:microjson:1.0:*:*:*:*:*:*:*
• cpe:2.3:a:eric_s._raymond:microjson:1.1:*:*:*:*:*:*:*
• cpe:2.3:a:eric_s._raymond:microjson:1.2:*:*:*:*:*:*:*

External links

https://ics-cert.us-cert.gov/advisories/ICSA-18-310-01

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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