HTTP response splitting in squid (Alpine package)

1) HTTP response splitting

EUVDB-ID: #VU46118

Risk: Medium

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-15811

CWE-ID: CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting')

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform HTTP splitting attacks.

The vulnerability exists due to software does not corrector process CRLF character sequences. A remote authenticated attacker can send specially crafted request containing CRLF sequence and make the application to send a split HTTP response.

Successful exploitation of the vulnerability may allow an attacker perform cache poisoning attack.

Mitigation

Install update from vendor's website.

Vulnerable software versions

squid (Alpine package): 3.2.2-r0 - 4.13-r0

CPE2.3

• cpe:2.3:a:alpine:squid_alpine_package:3.2.2-r0:*:*:*:*:alpine_linux:*:2.3
• cpe:2.3:a:alpine:squid_alpine_package:3.2.8-r0:*:*:*:*:alpine_linux:*:2.4
• cpe:2.3:a:alpine:squid_alpine_package:3.2.9-r0:*:*:*:*:alpine_linux:*:2.3

External links

https://git.alpinelinux.org/aports/commit/?id=9de348c8a380524d77e318198e8d208bfaa7d15f

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.