CVE-2020-11767
Published Apr 15, 2020
Last updated 3 years ago
Overview
- Description
- Istio through 1.5.1 and Envoy through 1.14.1 have a data-leak issue. If there is a TCP connection (negotiated with SNI over HTTPS) to *.example.com, a request for a domain concurrently configured explicitly (e.g., abc.example.com) is sent to the server(s) listening behind *.example.com. The outcome should instead be 421 Misdirected Request. Imagine a shared caching forward proxy re-using an HTTP/2 connection for a large subnet with many users. If a victim is interacting with abc.example.com, and a server (for abc.example.com) recycles the TCP connection to the forward proxy, the victim's browser may suddenly start sending sensitive data to a *.example.com server. This occurs because the forward proxy between the victim and the origin server reuses connections (which obeys the specification), but neither Istio nor Envoy corrects this by sending a 421 error. Similarly, this behavior voids the security model browsers have put in place between domains.
- Source
- cve@mitre.org
- NVD status
- Analyzed
Social media
- Hype score
- Not currently trending
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 3.1
- Impact score
- 1.4
- Exploitability score
- 1.6
- Vector string
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- Severity
- LOW
CVSS 2.0
- Type
- Primary
- Base score
- 2.6
- Impact score
- 2.9
- Exploitability score
- 4.9
- Vector string
- AV:N/AC:H/Au:N/C:P/I:N/A:N
Weaknesses
- nvd@nist.gov
- NVD-CWE-noinfo
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "CCE5F040-C8AF-4F73-AB1F-D0A2752AD185",
"versionEndIncluding": "1.14.1"
},
{
"criteria": "cpe:2.3:a:istio:istio:*:*:*:*:*:*:*:*",
"vulnerable": true,
"matchCriteriaId": "2122D404-F673-4F12-B91C-1338F3AEE5CC",
"versionEndIncluding": "1.5.1"
}
],
"operator": "OR"
}
]
}
]