Vulnerability identifier: #VU14320

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: N/A

CWE-ID: CWE-416

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
lighttpd
Server applications / Web servers

Vendor: lighttpd

Description

The vulnerability allows a remote attacker to gain cause denial of service conditions.

The vulnerability exists due to use-after-free error when processing data passed via Range HTTP header. A remote unauthenticated attacker can send a specially crafted HTTP request to the affected server, trigger use-after-free error and crash the affected web server. 

Mitigation
Update to version 1.4.50.

Vulnerable software versions

lighttpd: 1.4.1 - 1.4.49

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External links
http://github.com/lighttpd/lighttpd1.4/commit/d161f53de04bc826ce1bdaeb3dce2c72ca50a3f8 
http://www.lighttpd.net/2018/8/13/1.4.50/

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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.