OS Command Injection in unbound (Alpine package)

1) OS Command Injection

EUVDB-ID: #VU29236

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18934

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary shell commands on the target system.

The vulnerability exists due to insufficient validation of user-supplied input in the ipsec module. A remote attacker can pass specially crafted input to the application and execute arbitrary commands on the system.

Successful exploitation of he vulnerability requires that unbound is compiled with `--enable-ipsecmod` support, and ipsecmod is enabled and used in the configuration.

Mitigation

Install update from vendor's website.

Vulnerable software versions

unbound (Alpine package): 1.7.3-r0 - 1.7.3-r1

External links

http://git.alpinelinux.org/aports/commit/?id=3286876175392eea49a76b591165c2e940681c66
http://git.alpinelinux.org/aports/commit/?id=2986d9e83b920ffacf364d4ee6c2a5644a330152
http://git.alpinelinux.org/aports/commit/?id=407d97afdcc1f3eabf878b21614f0cc72b0f336f
http://git.alpinelinux.org/aports/commit/?id=85b36404206898cf9dc3221509b3e0ddac87c7ae
http://git.alpinelinux.org/aports/commit/?id=ae112bcbe065a2f232ad8c641ab8da6b84f7e74c
http://git.alpinelinux.org/aports/commit/?id=83d913bbc572f3811e9afbd81f9fb751a5e5be5b

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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