#VU35637 Input validation error in Istio - CVE-2019-14993

Vulnerability identifier: #VU35637

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-14993

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Istio
Web applications / Other software

Vendor: Istio

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

Istio before 1.1.13 and 1.2.x before 1.2.4 mishandles regular expressions for long URIs, leading to a denial of service during use of the JWT, VirtualService, HTTPAPISpecBinding, or QuotaSpecBinding API.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Istio: 1.2.1 - 1.2.3

---

External links
https://discuss.istio.io/t/upcoming-security-updates-in-istio-1-2-4-and-1-1-13/3383
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86164
https://github.com/envoyproxy/envoy/issues/7728
https://istio.io/blog/2019/istio-security-003-004/

---

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.