oss-security - CVE-2022-24112: Apache APISIX: apisix/batch-requests plugin allows overwriting the X-REAL-IP header

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Message-ID: <CAADJU122drfk2TE_bLJ=HoWJG_T6Rxnq0ngX+GQqOGXFmEoKNA@mail.gmail.com>
Date: Fri, 11 Feb 2022 16:51:21 +0800
From: Zexuan Luo <spacewander@...che.org>
To: announce@...che.org, dev@...six.apache.org, 
	Apache Security Team <security@...che.org>, oss-security@...ts.openwall.com, 
	Live Overflow <liveoverflow@...il.com>
Subject: CVE-2022-24112: Apache APISIX: apisix/batch-requests plugin allows
 overwriting the X-REAL-IP header

Severity: high

Description:

An attacker can abuse the batch-requests plugin to send requests to
bypass the IP restriction of Admin API.
A default configuration of Apache APISIX (with default API key) is
vulnerable to remote code execution.
When the admin key was changed or the port of Admin API was changed to
a port different from the data panel, the impact is lower. But there
is still a risk to bypass the IP restriction of Apache APISIX's data
panel.

There is a check in the batch-requests plugin which overrides the
client IP with its real remote IP. But due to a bug in the code, this
check can be bypassed.

Mitigation:

1. explicitly configure the enabled plugins in `conf/config.yaml`,
ensure `batch-requests` is disabled. (Or just comment out
`batch-requests` in `conf/config-default.yaml`)
Or
1. upgrade to 2.10.4 or 2.12.1.

Credit:

Original discovery by Real World CTF at Chaitin Tech. Reported by Sauercloud.

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