Input validation error in lighttpd



| Updated: 2020-07-28
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2012-5533
CWE-ID CWE-20
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 lighttpd
Server applications / Web servers

Vendor lighttpd

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU32618

Risk: Medium

CVSSv4.0: 5.5 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/U:Green]

CVE-ID: CVE-2012-5533

CWE-ID: CWE-20 - Improper input validation

Exploit availability: Yes

Description

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

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (infinite loop) via a request with a header containing an empty token, as demonstrated using the "Connection: TE,,Keep-Alive" header.

Mitigation

The vendor has issued the following versions to address this vulnerability: 1.4.31, 1.4.32.

Vulnerable software versions

lighttpd: 1.4.1 - 1.4.30

CPE2.3 External links

https://download.lighttpd.net/lighttpd/security/lighttpd_sa_2012_01.txt
https://download.lighttpd.net/lighttpd/security/lighttpd-1.4.31_fix_connection_header_dos.patch
https://lists.opensuse.org/opensuse-updates/2012-11/msg00044.html
https://lists.opensuse.org/opensuse-updates/2014-01/msg00051.html
https://marc.info/?l=bugtraq&m=141576815022399&w=2
https://osvdb.org/87623
https://packetstormsecurity.org/files/118282/Simple-Lighttpd-1.4.31-Denial-Of-Service.html
https://secunia.com/advisories/51268
https://secunia.com/advisories/51298
https://www.exploit-db.com/exploits/22902
https://www.mandriva.com/security/advisories?name=MDVSA-2013:100
https://www.openwall.com/lists/oss-security/2012/11/21/1
https://www.securityfocus.com/bid/56619
https://www.securitytracker.com/id?1027802
https://exchange.xforce.ibmcloud.com/vulnerabilities/80213
https://wiki.mageia.org/en/Support/Advisories/MGASA-2012-0345


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.



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