#VU11633 Improper input validation in etcd - CVE-2018-1099

Vulnerability identifier: #VU11633

Vulnerability risk: Low

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-1099

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
etcd
Server applications / Database software

Vendor: CoreOS

Description
The vulnerability allows a remote unauthenticated attacker to bypass security restrictions on the target system.

The weakness exists due to improper validation of DNS hostnames. A remote attacker can send specially crafted requests, bypass security restrictions and gain network access to internal systems.

Mitigation
Update to version 3.3.2 or later.

Vulnerable software versions

etcd: 2.3.8 - 3.3.1

---

External links
https://github.com/coreos/etcd/issues/9353

---

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.