Red Hat Software Collections update for varnish

1) Reachable Assertion

EUVDB-ID: #VU20863

Risk: Low

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

CVE-ID: CVE-2019-15892

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion when parsing HTTP/1 requests. A remote attacker can send specially crafted HTTP/1 requests to the affected server and trigger application restart, resulting in a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Red Hat Software Collections: 1 for RHEL 7.7

rh-varnish6-varnish-modules (Red Hat package): before 0.15.0-6.el7

rh-varnish6-varnish (Red Hat package): before 6.0.6-1.el7

rh-varnish6 (Red Hat package): before 4.1-6.el7

CPE2.3

• cpe:2.3:a:red_hat:red_hat_software_collections:1 for RHEL 7.7:*:*:*:*:*:*:*
• cpe:2.3:a:red_hat:rh-varnish6-varnish-modules_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:a:red_hat:rh-varnish6-varnish_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*
• cpe:2.3:a:red_hat:rh-varnish6_redhat_package:*:*:*:*:*:red_hat_enterprise_linux:*:*

External links

https://access.redhat.com/errata/RHEA-2020:2262

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.