Vulnerability identifier: #VU17107

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-20615

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
HAProxy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: HAProxy

Description

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

The vulnerability exists due to incorrect frame length validation when processing headers with priority flags set. A remote attacker can send a specially crafted HTTP/2 request, trigger our-of-bounds read and crash the affected application.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

HAProxy: 1.8.0 - 1.8.16

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External links
http://www.mail-archive.com/haproxy@formilux.org/msg32304.html

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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.