Vulnerabilities > CVE-2014-8517 - Command Injection vulnerability in multiple products
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
The fetch_url function in usr.bin/ftp/fetch.c in tnftp, as used in NetBSD 5.1 through 5.1.4, 5.2 through 5.2.2, 6.0 through 6.0.6, and 6.1 through 6.1.5 allows remote attackers to execute arbitrary commands via a | (pipe) character at the end of an HTTP redirect.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Cause Web Server Misclassification An attack of this type exploits a Web server's decision to take action based on filename or file extension. Because different file types are handled by different server processes, misclassification may force the Web server to take unexpected action, or expected actions in an unexpected sequence. This may cause the server to exhaust resources, supply debug or system data to the attacker, or bind an attacker to a remote process. This type of vulnerability has been found in many widely used servers including IIS, Lotus Domino, and Orion. The attacker's job in this case is straightforward, standard communication protocols and methods are used and are generally appended with malicious information at the tail end of an otherwise legitimate request. The attack payload varies, but it could be special characters like a period or simply appending a tag that has a special meaning for operations on the server side like .jsp for a java application server. The essence of this attack is that the attacker deceives the server into executing functionality based on the name of the request, i.e. login.jsp, not the contents.
- LDAP Injection An attacker manipulates or crafts an LDAP query for the purpose of undermining the security of the target. Some applications use user input to create LDAP queries that are processed by an LDAP server. For example, a user might provide their username during authentication and the username might be inserted in an LDAP query during the authentication process. An attacker could use this input to inject additional commands into an LDAP query that could disclose sensitive information. For example, entering a * in the aforementioned query might return information about all users on the system. This attack is very similar to an SQL injection attack in that it manipulates a query to gather additional information or coerce a particular return value.
- Command Delimiters An attack of this type exploits a programs' vulnerabilities that allows an attacker's commands to be concatenated onto a legitimate command with the intent of targeting other resources such as the file system or database. The system that uses a filter or a blacklist input validation, as opposed to whitelist validation is vulnerable to an attacker who predicts delimiters (or combinations of delimiters) not present in the filter or blacklist. As with other injection attacks, the attacker uses the command delimiter payload as an entry point to tunnel through the application and activate additional attacks through SQL queries, shell commands, network scanning, and so on.
- File System Function Injection, Content Based An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
- Exploiting Multiple Input Interpretation Layers An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: In such cases, the attacker will need to provide input that will pass through the input validator, but after passing through parser2, will be converted into something that the input validator was supposed to stop.
Exploit-Db
description tnftp - 'savefile' Arbitrary Command Execution (Metasploit). CVE-2014-8517. Remote exploit for Unix platform. Tags: Metasploit Framework (MSF) file exploits/unix/remote/43112.rb id EDB-ID:43112 last seen 2017-11-04 modified 2017-11-03 platform unix port published 2017-11-03 reporter Exploit-DB source https://www.exploit-db.com/download/43112/ title tnftp - 'savefile' Arbitrary Command Execution (Metasploit) type remote description tnftp - clientside BSD Exploit. CVE-2014-8517. Remote exploit for bsd platform id EDB-ID:35427 last seen 2016-02-04 modified 2014-12-02 published 2014-12-02 reporter dash source https://www.exploit-db.com/download/35427/ title tnftp - clientside BSD Exploit
Metasploit
description This module exploits an arbitrary command execution vulnerability in tnftp's handling of the resolved output filename - called "savefile" in the source - from a requested resource. If tnftp is executed without the -o command-line option, it will resolve the output filename from the last component of the requested resource. If the output filename begins with a "|" character, tnftp will pass the fetched resource's output to the command directly following the "|" character through the use of the popen() function. id MSF:AUXILIARY/SERVER/TNFTP_SAVEFILE last seen 2019-10-22 modified 1976-01-01 published 1976-01-01 references reporter Rapid7 title tnftp "savefile" Arbitrary Command Execution description This module exploits an arbitrary command execution vulnerability in tnftp's handling of the resolved output filename - called "savefile" in the source - from a requested resource. If tnftp is executed without the -o command-line option, it will resolve the output filename from the last component of the requested resource. If the output filename begins with a "|" character, tnftp will pass the fetched resource's output to the command directly following the "|" character through the use of the popen() function. id MSF:EXPLOIT/UNIX/HTTP/TNFTP_SAVEFILE last seen 2020-06-05 modified 2018-11-16 published 2017-11-01 references reporter Rapid7 source https://github.com/rapid7/metasploit-framework/blob/master//modules/exploits/unix/http/tnftp_savefile.rb title tnftp "savefile" Arbitrary Command Execution
Nessus
NASL family MacOS X Local Security Checks NASL id MACOSX_SECUPD2015-001.NASL description The remote host is running a version of Mac OS X 10.8 or 10.9 that does not have Security Update 2015-001 applied. This update contains several security-related fixes for the following components : - AFP Server - Bluetooth - CoreGraphics - CoreSymbolication - FontParser - Foundation - Intel Graphics Driver - IOAcceleratorFamily - IOHIDFamily - Kernel - LaunchServices - libnetcore - LoginWindow - lukemftp - OpenSSL - Sandbox - SceneKit - Security - security_taskgate - Spotlight - sysmond Note that successful exploitation of the most serious issues can result in arbitrary code execution. last seen 2020-06-01 modified 2020-06-02 plugin id 81088 published 2015-01-29 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/81088 title Mac OS X Multiple Vulnerabilities (Security Update 2015-001) (POODLE) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(81088); script_version("1.15"); script_cvs_date("Date: 2019/06/19 15:17:43"); script_cve_id( "CVE-2011-2391", "CVE-2014-3566", "CVE-2014-3567", "CVE-2014-3568", "CVE-2014-4426", "CVE-2014-4461", "CVE-2014-4481", "CVE-2014-4483", "CVE-2014-4484", "CVE-2014-4485", "CVE-2014-4486", "CVE-2014-4487", "CVE-2014-4488", "CVE-2014-4489", "CVE-2014-4491", "CVE-2014-4492", "CVE-2014-4495", "CVE-2014-4497", "CVE-2014-7861", "CVE-2014-8517", "CVE-2014-8816", "CVE-2014-8817", "CVE-2014-8819", "CVE-2014-8820", "CVE-2014-8821", "CVE-2014-8822", "CVE-2014-8824", "CVE-2014-8826", "CVE-2014-8827", "CVE-2014-8828", "CVE-2014-8829", "CVE-2014-8830", "CVE-2014-8831", "CVE-2014-8832", "CVE-2014-8835", "CVE-2014-8838" ); script_bugtraq_id( 62531, 70249, 70574, 70585, 70586, 70623, 70792, 71136, 72327, 72328 ); script_xref(name:"CERT", value:"577193"); script_xref(name:"APPLE-SA", value:"APPLE-SA-2015-01-27-4"); script_name(english:"Mac OS X Multiple Vulnerabilities (Security Update 2015-001) (POODLE)"); script_summary(english:"Checks for the presence of Security Update 2015-001."); script_set_attribute(attribute:"synopsis", value: "The remote host is missing a Mac OS X update that fixes multiple security issues."); script_set_attribute(attribute:"description", value: "The remote host is running a version of Mac OS X 10.8 or 10.9 that does not have Security Update 2015-001 applied. This update contains several security-related fixes for the following components : - AFP Server - Bluetooth - CoreGraphics - CoreSymbolication - FontParser - Foundation - Intel Graphics Driver - IOAcceleratorFamily - IOHIDFamily - Kernel - LaunchServices - libnetcore - LoginWindow - lukemftp - OpenSSL - Sandbox - SceneKit - Security - security_taskgate - Spotlight - sysmond Note that successful exploitation of the most serious issues can result in arbitrary code execution."); script_set_attribute(attribute:"see_also", value:"https://support.apple.com/en-us/HT204244"); script_set_attribute(attribute:"see_also", value:"http://www.securityfocus.com/archive/1/534559"); script_set_attribute(attribute:"see_also", value:"https://www.imperialviolet.org/2014/10/14/poodle.html"); script_set_attribute(attribute:"see_also", value:"https://www.openssl.org/~bodo/ssl-poodle.pdf"); script_set_attribute(attribute:"see_also", value:"https://tools.ietf.org/html/draft-ietf-tls-downgrade-scsv-00"); script_set_attribute(attribute:"solution", value: "Install Security Update 2015-001 or later."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C"); script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C"); script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"); script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C"); script_set_attribute(attribute:"cvss_score_source", value:"CVE-2014-4486"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"metasploit_name", value:'tnftp "savefile" Arbitrary Command Execution'); script_set_attribute(attribute:"exploit_framework_metasploit", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2013/09/18"); script_set_attribute(attribute:"patch_publication_date", value:"2015/01/27"); script_set_attribute(attribute:"plugin_publication_date", value:"2015/01/29"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"cpe:/o:apple:mac_os_x"); script_set_attribute(attribute:"in_the_news", value:"true"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"MacOS X Local Security Checks"); script_copyright(english:"This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/MacOSX/Version", "Host/MacOSX/packages/boms"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("misc_func.inc"); patch = "2015-001"; # Compare 2 patch numbers to determine if patch requirements are satisfied. # Return true if this patch or a later patch is applied # Return false otherwise function check_patch(year, number) { local_var p_split = split(patch, sep:"-"); local_var p_year = int( p_split[0]); local_var p_num = int( p_split[1]); if (year > p_year) return TRUE; else if (year < p_year) return FALSE; else if (number >= p_num) return TRUE; else return FALSE; } if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); os = get_kb_item("Host/MacOSX/Version"); if (!os) audit(AUDIT_OS_NOT, "Mac OS X"); if (!ereg(pattern:"Mac OS X 10\.[89]([^0-9]|$)", string:os)) audit(AUDIT_OS_NOT, "Mac OS X 10.8 / 10.9"); else if ("Mac OS X 10.8" >< os && !ereg(pattern:"Mac OS X 10\.8($|\.[0-5]([^0-9]|$))", string:os)) exit(0, "The remote host uses a version of Mac OS X Mountain Lion later than 10.8.5."); else if ("Mac OS X 10.9" >< os && !ereg(pattern:"Mac OS X 10\.9($|\.[0-5]([^0-9]|$))", string:os)) exit(0, "The remote host uses a version of Mac OS X Mavericks later than 10.9.5."); packages = get_kb_item_or_exit("Host/MacOSX/packages/boms", exit_code:1); sec_boms_report = egrep(pattern:"^com\.apple\.pkg\.update\.security\..*bom$", string:packages); sec_boms = split(sec_boms_report, sep:'\n'); foreach package (sec_boms) { # Grab patch year and number match = eregmatch(pattern:"[^0-9](20[0-9][0-9])[-.]([0-9]{3})[^0-9]", string:package); if (empty_or_null(match[1]) || empty_or_null(match[2])) continue; patch_found = check_patch(year:int(match[1]), number:int(match[2])); if (patch_found) exit(0, "The host has Security Update " + patch + " or later installed and is therefore not affected."); } report = '\n Missing security update : ' + patch; report += '\n Installed security BOMs : '; if (sec_boms_report) report += str_replace(find:'\n', replace:'\n ', string:sec_boms_report); else report += 'n/a'; report += '\n'; security_report_v4(port:0, severity:SECURITY_HOLE, extra:report);NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_7488378D600711E6A6C314DAE9D210B8.NASL description A malicious HTTP server could cause ftp(1) to execute arbitrary commands. Impact : When operating on HTTP URIs, the ftp(1) client follows HTTP redirects, and uses the part of the path after the last last seen 2020-06-01 modified 2020-06-02 plugin id 92913 published 2016-08-12 reporter This script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/92913 title FreeBSD : FreeBSD -- Remote command execution in ftp(1) (7488378d-6007-11e6-a6c3-14dae9d210b8) code # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from the FreeBSD VuXML database : # # Copyright 2003-2018 Jacques Vidrine and contributors # # Redistribution and use in source (VuXML) and 'compiled' forms (SGML, # HTML, PDF, PostScript, RTF and so forth) with or without modification, # are permitted provided that the following conditions are met: # 1. Redistributions of source code (VuXML) must retain the above # copyright notice, this list of conditions and the following # disclaimer as the first lines of this file unmodified. # 2. Redistributions in compiled form (transformed to other DTDs, # published online in any format, converted to PDF, PostScript, # RTF and other formats) must reproduce the above copyright # notice, this list of conditions and the following disclaimer # in the documentation and/or other materials provided with the # distribution. # # THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, # OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT # OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR # BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, # WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE # OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION, # EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. # include("compat.inc"); if (description) { script_id(92913); script_version("2.4"); script_cvs_date("Date: 2018/12/05 20:31:22"); script_cve_id("CVE-2014-8517"); script_bugtraq_id(70792); script_xref(name:"FreeBSD", value:"SA-14:26.ftp"); script_name(english:"FreeBSD : FreeBSD -- Remote command execution in ftp(1) (7488378d-6007-11e6-a6c3-14dae9d210b8)"); script_summary(english:"Checks for updated packages in pkg_info output"); script_set_attribute( attribute:"synopsis", value: "The remote FreeBSD host is missing one or more security-related updates." ); script_set_attribute( attribute:"description", value: "A malicious HTTP server could cause ftp(1) to execute arbitrary commands. Impact : When operating on HTTP URIs, the ftp(1) client follows HTTP redirects, and uses the part of the path after the last '/' from the last resource it accesses as the output filename if '-o' is not specified. If the output file name provided by the server begins with a pipe ('|'), the output is passed to popen(3), which might be used to execute arbitrary commands on the ftp(1) client machine." ); # https://vuxml.freebsd.org/freebsd/7488378d-6007-11e6-a6c3-14dae9d210b8.html script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?483205af" ); script_set_attribute(attribute:"solution", value:"Update the affected packages."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"metasploit_name", value:'tnftp "savefile" Arbitrary Command Execution'); script_set_attribute(attribute:"exploit_framework_metasploit", value:"true"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:freebsd:freebsd:FreeBSD"); script_set_attribute(attribute:"cpe", value:"cpe:/o:freebsd:freebsd"); script_set_attribute(attribute:"vuln_publication_date", value:"2014/11/04"); script_set_attribute(attribute:"patch_publication_date", value:"2016/08/11"); script_set_attribute(attribute:"plugin_publication_date", value:"2016/08/12"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2016-2018 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"FreeBSD Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/FreeBSD/release", "Host/FreeBSD/pkg_info", "Settings/ParanoidReport"); exit(0); } include("audit.inc"); include("freebsd_package.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); if (!get_kb_item("Host/FreeBSD/release")) audit(AUDIT_OS_NOT, "FreeBSD"); if (!get_kb_item("Host/FreeBSD/pkg_info")) audit(AUDIT_PACKAGE_LIST_MISSING); if (report_paranoia < 2) audit(AUDIT_PARANOID); flag = 0; if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=10.0<10.0_12")) flag++; if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=9.3<9.3_5")) flag++; if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=9.2<9.2_15")) flag++; if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=9.1<9.1_22")) flag++; if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=8.4<8.4_19")) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:pkg_report_get()); else security_hole(0); exit(0); } else audit(AUDIT_HOST_NOT, "affected");NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201611-05.NASL description The remote host is affected by the vulnerability described in GLSA-201611-05 (tnftp: Arbitrary code execution) The fetch_url function in usr.bin/ftp/fetch.c allows remote attackers to execute arbitrary commands via a Impact : A remote attacker could possibly execute arbitrary code with the privileges of the process. Workaround : There is no known workaround at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 94889 published 2016-11-15 reporter This script is Copyright (C) 2016-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/94889 title GLSA-201611-05 : tnftp: Arbitrary code execution NASL family MacOS X Local Security Checks NASL id MACOSX_10_10_2.NASL description The remote host is running a version of Mac OS X 10.10.x that is prior to version 10.10.2. This update contains several security-related fixes for the following components : - bash - Bluetooth - CFNetwork Cache - CommerceKit Framework - CoreGraphics - CoreSymbolication - CPU Software - FontParser - Foundation - Intel Graphics Driver - IOAcceleratorFamily - IOHIDFamily - IOKit - IOUSBFamily - Kernel - LaunchServices - libnetcore - LoginWindow - lukemftp - OpenSSL - Safari - SceneKit - Security - security_taskgate - Spotlight - SpotlightIndex - sysmond - UserAccountUpdater Note that successful exploitation of the most serious issues can result in arbitrary code execution. last seen 2020-06-01 modified 2020-06-02 plugin id 81087 published 2015-01-29 reporter This script is Copyright (C) 2015-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/81087 title Mac OS X 10.10.x < 10.10.2 Multiple Vulnerabilities (POODLE) NASL family SuSE Local Security Checks NASL id OPENSUSE-2014-639.NASL description tnftp was updated to fix the possible execution of commands by a remote attacker (CVE-2014-8517). last seen 2020-06-05 modified 2014-11-11 plugin id 79105 published 2014-11-11 reporter This script is Copyright (C) 2014-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/79105 title openSUSE Security Update : tnftp (openSUSE-SU-2014:1383-1) NASL family Fedora Local Security Checks NASL id FEDORA_2014-14113.NASL description Security fix for CVE-2014-8517 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 2020-03-17 modified 2014-11-12 plugin id 79196 published 2014-11-12 reporter This script is Copyright (C) 2014-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/79196 title Fedora 20 : tnftp-20141031-1.fc20 (2014-14113)
Packetstorm
| data source | https://packetstormsecurity.com/files/download/144874/tnftp_savefile.rb.txt |
| id | PACKETSTORM:144874 |
| last seen | 2017-11-03 |
| published | 2017-11-03 |
| reporter | wvu |
| source | https://packetstormsecurity.com/files/144874/tnftp-savefile-Arbitrary-Command-Execution.html |
| title | tnftp "savefile" Arbitrary Command Execution |
References
- http://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2014-013.txt.asc
- http://lists.apple.com/archives/security-announce/2015/Jan/msg00003.html
- http://lists.opensuse.org/opensuse-updates/2014-11/msg00029.html
- http://seclists.org/oss-sec/2014/q4/459
- http://seclists.org/oss-sec/2014/q4/464
- http://secunia.com/advisories/62028
- http://secunia.com/advisories/62260
- http://support.apple.com/HT204244
- https://security.gentoo.org/glsa/201611-05
- https://www.exploit-db.com/exploits/43112/