#VU94060 Use-after-free in lighttpd - CVE-2018-25103

Vulnerability identifier: #VU94060

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2018-25103

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 access to sensitive information.

The vulnerability exists due to a use-after-free error when handling HTTP requests. A remote attacker can send a specially crafted HTTP request to the server, trigger a use-after-free error and gain access to potentially sensitive information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

lighttpd: 1.0.2 - 1.4.50

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External links
https://www.runzero.com/blog/lighttpd/
https://github.com/lighttpd/lighttpd1.4/commit/df8e4f95614e476276a55e34da2aa8b00b1148e9
https://blogvdoo.wordpress.com/2018/11/06/giving-back-securing-open-source-iot-projects/#more-736
https://github.com/lighttpd/lighttpd1.4/commit/d161f53de04bc826ce1bdaeb3dce2c72ca50a3f8
https://9443417.fs1.hubspotusercontent-na1.net/hubfs/9443417/Security%20Advisories/2024/AMI-SA-2024002.pdf
https://www.kb.cert.org/vuls/id/312260

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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.