CRLF injection in haproxy (Alpine package)



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-19330
CWE-ID CWE-93
Exploitation vector Network
Public exploit N/A
Vulnerable software
 haproxy (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) CRLF injection

EUVDB-ID: #VU23084

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2019-19330

CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient validation of user-supplied input when processing CRLF and NUL character in the HTTP request, while converting headers from HTTP/2 to HTTP/1. A remote attacker can send a specially crafted HTTP/2 request to the HAProxy and inject arbitrary HTTP headers. Successful exploitation of the vulnerability may allow an attacker to bypass certain security restrictions or perform spoofing attacks.

Mitigation

Install update from vendor's website.

Vulnerable software versions

haproxy (Alpine package): 1.8.5-r0

CPE2.3 External links

https://git.alpinelinux.org/aports/commit/?id=45e394536a3bf2a562ad861feeca530477d4dfd0
https://git.alpinelinux.org/aports/commit/?id=d69c3c394b7bb54a302fe90b9f5227c6d204446c


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.



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