ID CVE-2007-4727
Summary 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."
Vulnerable Configurations
  • lighttpd 1.4.15
Base: 6.8 (as of 13-09-2007 - 08:56)
  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
  • Overflow Binary Resource File
    An attack of this type exploits a buffer overflow vulnerability in the handling of binary resources. Binary resources may include music files like MP3, image files like JPEG files, and any other binary file. These attacks may pass unnoticed to the client machine through normal usage of files, such as a browser loading a seemingly innocent JPEG file. This can allow the attacker access to the execution stack and execute arbitrary code in the target process. This attack pattern is a variant of standard buffer overflow attacks using an unexpected vector (binary files) to wrap its attack and open up a new attack vector. The attacker is required to either directly serve the binary content to the victim, or place it in a locale like a MP3 sharing application, for the victim to download. The attacker then is notified upon the download or otherwise locates the vulnerability opened up by the buffer overflow.
  • Buffer Overflow via Symbolic Links
    This type of attack leverages the use of symbolic links to cause buffer overflows. An attacker can try to create or manipulate a symbolic link file such that its contents result in out of bounds data. When the target software processes the symbolic link file, it could potentially overflow internal buffers with insufficient bounds checking.
  • Overflow Variables and Tags
    This type of attack leverages the use of tags or variables from a formatted configuration data to cause buffer overflow. The attacker crafts a malicious HTML page or configuration file that includes oversized strings, thus causing an overflow.
  • Buffer Overflow via Parameter Expansion
    In this attack, the target software is given input that the attacker knows will be modified and expanded in size during processing. This attack relies on the target software failing to anticipate that the expanded data may exceed some internal limit, thereby creating a buffer overflow.
  • Buffer Overflow in an API Call
    This attack targets libraries or shared code modules which are vulnerable to buffer overflow attacks. An attacker who has access to an API may try to embed malicious code in the API function call and exploit a buffer overflow vulnerability in the function's implementation. All clients that make use of the code library thus become vulnerable by association. This has a very broad effect on security across a system, usually affecting more than one software process.
  • Buffer Overflow in Local Command-Line Utilities
    This attack targets command-line utilities available in a number of shells. An attacker can leverage a vulnerability found in a command-line utility to escalate privilege to root.
nessus via4
  • NASL family SuSE Local Security Checks
    description This update fixes a buffer overflow in the fcgi_env_add() function. Under some circumstances this bug allows remote code execution. (CVE-2007-4727)
    last seen 2018-09-01
    modified 2014-06-13
    plugin id 27341
    published 2007-10-17
    reporter Tenable
    title openSUSE 10 Security Update : lighttpd (lighttpd-4532)
  • NASL family Debian Local Security Checks
    description Several vulnerabilities were discovered in lighttpd, a fast webserver with minimal memory footprint, which could allow the execution of arbitrary code via the overflow of CGI variables when mod_fcgi was enabled. The Common Vulnerabilities and Exposures project identifies the following problems : - CVE-2007-3946 The use of mod_auth could leave to a denial of service attack crashing the webserver. - CVE-2007-3947 The improper handling of repeated HTTP headers could cause a denial of service attack crashing the webserver. - CVE-2007-3949 A bug in mod_access potentially allows remote users to bypass access restrictions via trailing slash characters. - CVE-2007-3950 On 32-bit platforms users may be able to create denial of service attacks, crashing the webserver, via mod_webdav, mod_fastcgi, or mod_scgi.
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 25962
    published 2007-09-03
    reporter Tenable
    title Debian DSA-1362-2 : lighttpd - several vulnerabilities
  • NASL family Fedora Local Security Checks
    NASL id FEDORA_2007-2132.NASL
    description Lighttpd (1.4.17 and earlier) is prone to a header overflow when using the mod_fastcgi extension, this can lead to arbitrary code execution in the fastcgi application. This 1.4.18 update fixes the issue. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen 2019-02-21
    modified 2018-11-28
    plugin id 27752
    published 2007-11-06
    reporter Tenable
    title Fedora 7 : lighttpd-1.4.18-1.fc7 (2007-2132)
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-200709-16.NASL
    description The remote host is affected by the vulnerability described in GLSA-200709-16 (Lighttpd: Buffer overflow) Mattias Bengtsson and Philip Olausson have discovered a buffer overflow vulnerability in the function fcgi_env_add() in the file mod_fastcgi.c when processing overly long HTTP headers. Impact : A remote attacker could send a specially crafted request to the vulnerable Lighttpd server, resulting in the remote execution of arbitrary code with privileges of the user running the web server. Note that mod_fastcgi is disabled in Gentoo's default configuration. Workaround : Edit the file /etc/lighttpd/lighttpd.conf and comment the following line: 'include mod_fastcgi.conf'
    last seen 2019-02-21
    modified 2018-08-10
    plugin id 26214
    published 2007-10-03
    reporter Tenable
    title GLSA-200709-16 : Lighttpd: Buffer overflow
  • NASL family FreeBSD Local Security Checks
    NASL id FREEBSD_PKG_4B673AE75F9A11DC84DD000102CC8983.NASL
    description lighttpd maintainer reports : Lighttpd is prone to a header overflow when using the mod_fastcgi extension, this can lead to arbitrary code execution in the fastcgi application. For a detailed description of the bug see the external reference. This bug was found by Mattias Bengtsson and Philip Olausson
    last seen 2019-02-21
    modified 2018-11-10
    plugin id 26037
    published 2007-09-14
    reporter Tenable
    title FreeBSD : lighttpd -- FastCGI header overrun in mod_fastcgi (4b673ae7-5f9a-11dc-84dd-000102cc8983)
  • NASL family Web Servers
    description The remote web server appears to be lighttpd running with the FastCGI module (mod_fastcgi). The version of the FastCGI module on the remote host is affected by a buffer overflow vulnerability. A remote attacker can exploit this, by sending a specially crafted request with a long header, to add or replace headers passed to PHP, such as SCRIPT_FILENAME, which in turn could result in arbitrary code execution.
    last seen 2019-02-21
    modified 2018-07-13
    plugin id 26057
    published 2007-09-17
    reporter Tenable
    title lighttpd mod_fastcgi HTTP Request Header Remote Overflow
  • NASL family Gentoo Local Security Checks
    NASL id GENTOO_GLSA-200710-02.NASL
    description The remote host is affected by the vulnerability described in GLSA-200710-02 (PHP: Multiple vulnerabilities) Several vulnerabilities were found in PHP. Mattias Bengtsson and Philip Olausson reported integer overflows in the gdImageCreate() and gdImageCreateTrueColor() functions of the GD library which can cause heap-based buffer overflows (CVE-2007-3996). Gerhard Wagner discovered an integer overflow in the chunk_split() function that can lead to a heap-based buffer overflow (CVE-2007-2872). Its incomplete fix caused incorrect buffer size calculation due to precision loss, also resulting in a possible heap-based buffer overflow (CVE-2007-4661 and CVE-2007-4660). A buffer overflow in the sqlite_decode_binary() of the SQLite extension found by Stefan Esser that was addressed in PHP 5.2.1 was not fixed correctly (CVE-2007-1887). Stefan Esser discovered an error in the zend_alter_ini_entry() function handling a memory_limit violation (CVE-2007-4659). Stefan Esser also discovered a flaw when handling interruptions with userspace error handlers that can be exploited to read arbitrary heap memory (CVE-2007-1883). Disclosure of sensitive memory can also be triggered due to insufficient boundary checks in the strspn() and strcspn() functions, an issue discovered by Mattias Bengtsson and Philip Olausson (CVE-2007-4657) Stefan Esser reported incorrect validation in the FILTER_VALIDATE_EMAIL filter of the Filter extension allowing arbitrary email header injection (CVE-2007-1900). NOTE: This CVE was referenced, but not fixed in GLSA 200705-19. Stanislav Malyshev found an error with unknown impact in the money_format() function when processing '%i' and '%n' tokens (CVE-2007-4658). zatanzlatan reported a buffer overflow in the php_openssl_make_REQ() function with unknown impact when providing a manipulated SSL configuration file (CVE-2007-4662). Possible memory corruption when trying to read EXIF data in exif_read_data() and exif_thumbnail() occurred with unknown impact. Several vulnerabilities that allow bypassing of open_basedir and other restrictions were reported, including the glob() function (CVE-2007-4663), the session_save_path(), ini_set(), and error_log() functions which can allow local command execution (CVE-2007-3378), involving the readfile() function (CVE-2007-3007), via the Session extension (CVE-2007-4652), via the MySQL extension (CVE-2007-3997) and in the dl() function which allows loading extensions outside of the specified directory (CVE-2007-4825). Multiple Denial of Service vulnerabilities were discovered, including a long 'library' parameter in the dl() function (CVE-2007-4887), in several iconv and xmlrpc functions (CVE-2007-4840 and CVE-2007-4783), in the setlocale() function (CVE-2007-4784), in the glob() and fnmatch() function (CVE-2007-4782 and CVE-2007-3806), a floating point exception in the wordwrap() function (CVE-2007-3998), a stack exhaustion via deeply nested arrays (CVE-2007-4670), an infinite loop caused by a specially crafted PNG image in the png_read_info() function of libpng (CVE-2007-2756) and several issues related to array conversion. Impact : Remote attackers might be able to exploit these issues in PHP applications making use of the affected functions, potentially resulting in the execution of arbitrary code, Denial of Service, execution of scripted contents in the context of the affected site, security bypass or information leak. Workaround : There is no known workaround at this time.
    last seen 2019-02-21
    modified 2018-11-14
    plugin id 26942
    published 2007-10-09
    reporter Tenable
    title GLSA-200710-02 : PHP: Multiple vulnerabilities
refmap via4
bid 25622
bugtraq 20070917 FLEA-2007-0054-1 lighttpd
fedora FEDORA-2007-2132
gentoo GLSA-200709-16
  • 26732
  • 26794
  • 26824
  • 26997
  • 27229
sreason 3127
suse SUSE-SR:2007:020
vupen ADV-2007-3110
xf lighttpd-modfastcgi-code-execution(36526)
Last major update 07-03-2011 - 21:59
Published 12-09-2007 - 15:17
Last modified 15-10-2018 - 17:37
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