Jan Kneschke lighttpd 1.4.15 mod_fastcgi memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

A vulnerability has been found in Jan Kneschke lighttpd 1.4.15 (Web Server) and classified as critical. This vulnerability affects an unknown functionality of the component mod_fastcgi. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, and integrity. CVE summarizes:

Buffer overflow in the fcgi_env_add function in mod_proxy_backend_fastcgi.c in the mod_fastcgi extension in lighttpd before 1.4.18 allows remote attackers to overwrite arbitrary CGI variables and execute arbitrary code via an HTTP request with a long content length, as demonstrated by overwriting the SCRIPT_FILENAME variable, aka a "header overflow."

The bug was discovered 09/09/2007. The weakness was presented 09/10/2007 by Mattias Bengtsson Philip Olausson with SECWEB (Website). The advisory is available at secweb.se. This vulnerability was named CVE-2007-4727 since 09/05/2007. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at d2sec.com. It is declared as functional. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 27341 (openSUSE 10 Security Update : lighttpd (lighttpd-4532)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 87353 (lighttpd Buffer Overflow Vulnerability).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at lighttpd.net. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 8980.

The vulnerability is also documented in the databases at X-Force (36526) and Tenable (27341). See 458, 992, 1454 and 2668 for similar entries.

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CPE 2.3info

CPE 2.2info

CVSSv4info

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CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.5
VulDB Temp Score: 6.0
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CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Functional
Download: 🔍

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Nessus ID: 27341
Nessus Name: openSUSE 10 Security Update : lighttpd (lighttpd-4532)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
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Nessus Port: 🔍

OpenVAS ID: 58644
OpenVAS Name: Debian Security Advisory DSA 1362-2 (lighttpd)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
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Threat Intelligenceinfo

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Countermeasuresinfo

Recommended: Upgrade
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Patch: lighttpd.net
TippingPoint: 🔍

McAfee IPS: 🔍
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Timelineinfo

09/05/2007 🔍
09/09/2007 +4 days 🔍
09/09/2007 +0 days 🔍
09/10/2007 +1 days 🔍
09/10/2007 +0 days 🔍
09/10/2007 +0 days 🔍
09/10/2007 +0 days 🔍
09/12/2007 +1 days 🔍
09/16/2007 +4 days 🔍
09/19/2007 +3 days 🔍
09/28/2007 +9 days 🔍
10/17/2007 +19 days 🔍
03/15/2021 +4898 days 🔍

Sourcesinfo

Advisory: 1986
Researcher: Mattias Bengtsson Philip Olausson
Organization: SECWEB
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2007-4727 (🔍)
OVAL: 🔍

X-Force: 36526 - lighttpd mod_fastcgi code execution, High Risk
Vulnerability Center: 16051 - Lighttpd <1.4.18 Buffer Overflow in mod_fastcgi Extension Allows Remote Code Execution, High
SecurityFocus: 25622 - Lighttpd Mod_FastCGI Request Headers Remote Header Overflow Vulnerability
Secunia: 26997
OSVDB: 36933 - lighttpd mod_fastcgi HTTP Request Header Overflow
Vupen: ADV-2007-3110

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 09/19/2007 09:00
Updated: 03/15/2021 17:53
Changes: 09/19/2007 09:00 (106), 07/25/2019 17:34 (1), 03/15/2021 17:53 (3)
Complete: 🔍

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