CVE-2020-25613

Description

An issue was discovered in Ruby through 2.5.8, 2.6.x through 2.6.6, and 2.7.x through 2.7.1. WEBrick, a simple HTTP server bundled with Ruby, had not checked the transfer-encoding header value rigorously. An attacker may potentially exploit this issue to bypass a reverse proxy (which also has a poor header check), which may lead to an HTTP Request Smuggling attack.

How to fix CVE-2020-25613

To remediate CVE-2020-25613, upgrade the affected package to a fixed version below.

—upgrade to 2.5.8-r1 or later
—upgrade to 2.5.9 or later
—upgrade to 2.5.9 or later
—upgrade to 9.3.9.0+ds-1 or later
—upgrade to 1.7.26-1+deb9u3 or later
—upgrade to 2.3.3-1+deb9u9 or later
—upgrade to 2.7.1-4 or later
—upgrade to 1.6.1 or later

Is CVE-2020-25613 being exploited?

Low — EPSS is 0.3%, meaning exploitation activity has not been observed at scale.

Affected packages (8)

from 0, < 2.5.8-r1
from 0, < 2.5.9, >= 2.6.0, < 2.6.7, >= 2.7.0, < 2.7.2
from 0, < 2.5.9, >= 2.6.0, < 2.6.7, >= 2.7.0, < 2.7.2
from 0, < 9.3.9.0+ds-1
from 0, < 1.7.26-1+deb9u3
from 0, < 2.3.3-1+deb9u9
from 0, < 2.7.1-4
>= 1.6.0, < 1.6.1

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N