Integer overflow in lighttpd

Published: 2019-04-23 | Updated: 2019-04-24
Severity Medium
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-11072
CWE ID CWE-190
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software lighttpd Subscribe
Vendor lighttpd

Security Advisory

This security advisory describes one medium risk vulnerability.

1) Integer overflow

Severity: Medium

CVSSv3: 6.7 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-11072

CWE-ID: CWE-190 - Integer Overflow or Wraparound

Description

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

The vulnerability exists due to signed integer overflow when processing "/%2F?" characters in burl_normalize_2F_to_slash_fix() function in burl.c, when url-path-2f-decode option is enabled. A remote attacker can send a specially crafted HTTP GET request to the affected server, trigger integer overflow and crash the service.

Mitigation

Install updates from vendor's repository.

Vulnerable software versions

lighttpd: 1.4.1, 1.4.2, 1.4.3, 1.4.4, 1.4.5, 1.4.6, 1.4.7, 1.4.8, 1.4.9, 1.4.10, 1.4.11, 1.4.12, 1.4.13, 1.4.14, 1.4.15, 1.4.16, 1.4.17, 1.4.18, 1.4.19, 1.4.20, 1.4.21, 1.4.22, 1.4.23, 1.4.24, 1.4.25, 1.4.26, 1.4.27, 1.4.28, 1.4.29, 1.4.30, 1.4.31, 1.4.32, 1.4.33, 1.4.34, 1.4.35, 1.4.36, 1.4.37, 1.4.38, 1.4.39, 1.4.40, 1.4.41, 1.4.42, 1.4.43, 1.4.44, 1.4.45, 1.4.46, 1.4.47, 1.4.48, 1.4.49, 1.4.50, 1.4.51, 1.4.52, 1.4.53

CPE External links

http://www.securityfocus.com/bid/107907
https://github.com/lighttpd/lighttpd1.4/commit/32120d5b8b3203fc21ccb9eafb0eaf824bb59354
https://redmine.lighttpd.net/issues/2945

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.