Path traversal in Apache APISIX



Published: 2021-11-26 | Updated: 2021-11-29
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-43557
CWE-ID CWE-22
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
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Apache APISIX
Server applications / Other server solutions

Vendor Apache Foundation

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Path traversal

EUVDB-ID: #VU58389

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-43557

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences in the request_uri parameter. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Apache APISIX: 2.10.0, 2.10.1

CPE2.3 External links

http://lists.apache.org/thread/18jyd458ptocr31rnkjs71w4h366mv7h
http://www.openwall.com/lists/oss-security/2021/11/22/2
http://www.openwall.com/lists/oss-security/2021/11/22/1
http://www.openwall.com/lists/oss-security/2021/11/23/1

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. However, proof of concept for this vulnerability is available.



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