Input validation error in lighttpd
| 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 Subscribe |
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
CVSSv3.1: 4.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C]
CVE-ID: CVE-2012-5533
CWE-ID:
CWE-20 - Improper input validation
Exploit availability: Yes
DescriptionThe 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.
MitigationThe vendor has issued the following versions to address this vulnerability: 1.4.31, 1.4.32.
Vulnerable software versionslighttpd: 1.4.1 - 1.4.30
External linkshttp://download.lighttpd.net/lighttpd/security/lighttpd_sa_2012_01.txt
http://download.lighttpd.net/lighttpd/security/lighttpd-1.4.31_fix_connection_header_dos.patch
http://lists.opensuse.org/opensuse-updates/2012-11/msg00044.html
http://lists.opensuse.org/opensuse-updates/2014-01/msg00051.html
http://marc.info/?l=bugtraq&m=141576815022399&w=2
http://osvdb.org/87623
http://packetstormsecurity.org/files/118282/Simple-Lighttpd-1.4.31-Denial-Of-Service.html
http://secunia.com/advisories/51268
http://secunia.com/advisories/51298
http://www.exploit-db.com/exploits/22902
http://www.mandriva.com/security/advisories?name=MDVSA-2013:100
http://www.openwall.com/lists/oss-security/2012/11/21/1
http://www.securityfocus.com/bid/56619
http://www.securitytracker.com/id?1027802
http://exchange.xforce.ibmcloud.com/vulnerabilities/80213
http://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.
