Infinite loop in envoy
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2019-18836 |
| CWE-ID | CWE-835 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
envoy Server applications / IDS/IPS systems, Firewalls and proxy servers |
| Vendor | Cloud Native Computing Foundation |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Infinite loop
EUVDB-ID: #VU35101
Risk: Medium
CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-18836
CWE-ID:
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
Envoy 1.12.0 allows a remote denial of service because of resource loops, as demonstrated by a single idle TCP connection being able to keep a worker thread in an infinite busy loop when continue_on_listener_filters_timeout is used."
MitigationInstall update from vendor's website.
Vulnerable software versionsenvoy: 1.12.0
External linkshttp://blog.envoyproxy.io
http://github.com/envoyproxy/envoy/security/advisories/GHSA-3xvf-4396-cj46
http://github.com/istio/istio/issues/18229
http://groups.google.com/forum/#!forum/envoy-users
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
