#VU32582 Out-of-bounds read in lighttpd - CVE-2013-7205

Vulnerability identifier: #VU32582

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:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2013-7205

CWE-ID: CWE-125

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
lighttpd
Server applications / Web servers

Vendor: lighttpd

Description

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

The vulnerability exists due to a boundary condition when processing a long string in the last key value in the variable list, which triggers a heap-based buffer over-read within the Off-by-one error in the process_cgivars function in contrib/daemonchk.c. A remote attacker can create a specially crafted file, pass it to the application, trigger out-of-bounds read error and crash the affected application.

Mitigation
Install update from vendor's website.

Vulnerable software versions

lighttpd: 1.4.40

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External links
https://secunia.com/advisories/55976
https://sourceforge.net/p/nagios/nagioscore/ci/d97e03f32741a7d851826b03ed73ff4c9612a866/
https://www.mandriva.com/security/advisories?name=MDVSA-2014:004
https://www.openwall.com/lists/oss-security/2013/12/24/1
https://www.securityfocus.com/bid/64489
https://lists.debian.org/debian-lts-announce/2018/12/msg00014.html

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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.