Amazon Linux AMI update for varnish

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU60291

Risk: Medium

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2022-23959

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP/1 requests. A remote attacker can send a specially crafted HTTP/1 request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation

Update the affected packages:

i686:
    varnish-libs-4.0.5-3.23.amzn1.i686
    varnish-libs-devel-4.0.5-3.23.amzn1.i686
    varnish-docs-4.0.5-3.23.amzn1.i686
    varnish-4.0.5-3.23.amzn1.i686
    varnish-debuginfo-4.0.5-3.23.amzn1.i686

src:
    varnish-4.0.5-3.23.amzn1.src

x86_64:
    varnish-libs-4.0.5-3.23.amzn1.x86_64
    varnish-libs-devel-4.0.5-3.23.amzn1.x86_64
    varnish-4.0.5-3.23.amzn1.x86_64
    varnish-docs-4.0.5-3.23.amzn1.x86_64
    varnish-debuginfo-4.0.5-3.23.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

varnish: before 4.0.5-3.23

CPE2.3

• cpe:2.3:o:amazon_web_services:amazon_linux_ami:*:*:*:*:*:*:*:*
• cpe:2.3:o:amazon_web_services:varnish:*:*:*:*:*:amazon_linux_ami:*:*

External links

https://alas.aws.amazon.com/ALAS-2022-1632.html

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.