Vulnerabilities > CVE-2010-2251 - Improper Input Validation vulnerability in Alexander V. Lukyanov Lftp
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
The get1 command, as used by lftpget, in LFTP before 4.0.6 does not properly validate a server-provided filename before determining the destination filename of a download, which allows remote servers to create or overwrite arbitrary files via a Content-Disposition header that suggests a crafted filename, and possibly execute arbitrary code as a consequence of writing to a dotfile in a home directory.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- 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.
- Server Side Include (SSI) Injection An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
- Cross Zone Scripting An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
- Cross Site Scripting through Log Files An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
- Command Line Execution through SQL Injection An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.
Nessus
NASL family SuSE Local Security Checks NASL id SUSE_11_1_LFTP-100610.NASL description This update of lftp improves the filename handling of downloaded files to avoid downloading arbitrary content to unexpected locations (like .login). (CVE-2010-2251) last seen 2020-06-01 modified 2020-06-02 plugin id 47121 published 2010-06-23 reporter This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/47121 title openSUSE Security Update : lftp (openSUSE-SU-2010:0334-1) code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from openSUSE Security Update lftp-2534. # # The text description of this plugin is (C) SUSE LLC. # include("compat.inc"); if (description) { script_id(47121); script_version("1.8"); script_cvs_date("Date: 2019/10/25 13:36:38"); script_cve_id("CVE-2010-2251"); script_name(english:"openSUSE Security Update : lftp (openSUSE-SU-2010:0334-1)"); script_summary(english:"Check for the lftp-2534 patch"); script_set_attribute( attribute:"synopsis", value:"The remote openSUSE host is missing a security update." ); script_set_attribute( attribute:"description", value: "This update of lftp improves the filename handling of downloaded files to avoid downloading arbitrary content to unexpected locations (like .login). (CVE-2010-2251)" ); script_set_attribute( attribute:"see_also", value:"https://bugzilla.novell.com/show_bug.cgi?id=606319" ); script_set_attribute( attribute:"see_also", value:"https://lists.opensuse.org/opensuse-updates/2010-06/msg00006.html" ); script_set_attribute(attribute:"solution", value:"Update the affected lftp package."); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:lftp"); script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:11.1"); script_set_attribute(attribute:"patch_publication_date", value:"2010/06/10"); script_set_attribute(attribute:"plugin_publication_date", value:"2010/06/23"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"SuSE Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu"); exit(0); } include("audit.inc"); include("global_settings.inc"); include("rpm.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); release = get_kb_item("Host/SuSE/release"); if (isnull(release) || release =~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "openSUSE"); if (release !~ "^(SUSE11\.1)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "11.1", release); if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING); ourarch = get_kb_item("Host/cpu"); if (!ourarch) audit(AUDIT_UNKNOWN_ARCH); if (ourarch !~ "^(i586|i686|x86_64)$") audit(AUDIT_ARCH_NOT, "i586 / i686 / x86_64", ourarch); flag = 0; if ( rpm_check(release:"SUSE11.1", reference:"lftp-3.6.3-5.68.1") ) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:rpm_report_get()); else security_hole(0); exit(0); } else { tested = pkg_tests_get(); if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested); else audit(AUDIT_PACKAGE_NOT_INSTALLED, "lftp"); }NASL family CentOS Local Security Checks NASL id CENTOS_RHSA-2010-0585.NASL description An updated lftp package that fixes one security issue is now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. LFTP is a sophisticated file transfer program for the FTP and HTTP protocols. Like Bash, it has job control and uses the Readline library for input. It has bookmarks, built-in mirroring, and can transfer several files in parallel. It is designed with reliability in mind. It was discovered that lftp trusted the file name provided in the Content-Disposition HTTP header. A malicious HTTP server could use this flaw to write or overwrite files in the current working directory of a victim running lftp, by sending a different file from what the victim requested. (CVE-2010-2251) To correct this flaw, the following changes were made to lftp: the last seen 2020-06-01 modified 2020-06-02 plugin id 48219 published 2010-08-03 reporter This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/48219 title CentOS 5 : lftp (CESA-2010:0585) NASL family Red Hat Local Security Checks NASL id REDHAT-RHSA-2010-0585.NASL description An updated lftp package that fixes one security issue is now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. LFTP is a sophisticated file transfer program for the FTP and HTTP protocols. Like Bash, it has job control and uses the Readline library for input. It has bookmarks, built-in mirroring, and can transfer several files in parallel. It is designed with reliability in mind. It was discovered that lftp trusted the file name provided in the Content-Disposition HTTP header. A malicious HTTP server could use this flaw to write or overwrite files in the current working directory of a victim running lftp, by sending a different file from what the victim requested. (CVE-2010-2251) To correct this flaw, the following changes were made to lftp: the last seen 2020-06-01 modified 2020-06-02 plugin id 48232 published 2010-08-03 reporter This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/48232 title RHEL 5 : lftp (RHSA-2010:0585) NASL family Debian Local Security Checks NASL id DEBIAN_DSA-2085.NASL description It was discovered that in lftp, a command-line HTTP/FTP client, there is no proper validation of the filename provided by the server through the Content-Disposition header; attackers can use this flaw by suggesting a filename they wish to overwrite on the client machine, and then possibly execute arbitrary code (for instance if the attacker elects to write a dotfile in a home directory). last seen 2020-06-01 modified 2020-06-02 plugin id 48247 published 2010-08-05 reporter This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/48247 title Debian DSA-2085-1 : lftp - missing input validation NASL family SuSE Local Security Checks NASL id SUSE_11_2_LFTP-100610.NASL description This update of lftp improves the filename handling of downloaded files to avoid downloading arbitrary content to unexpected locations (like .login). (CVE-2010-2251) last seen 2020-06-01 modified 2020-06-02 plugin id 47122 published 2010-06-23 reporter This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/47122 title openSUSE Security Update : lftp (openSUSE-SU-2010:0334-1) NASL family Oracle Linux Local Security Checks NASL id ORACLELINUX_ELSA-2010-0585.NASL description From Red Hat Security Advisory 2010:0585 : An updated lftp package that fixes one security issue is now available for Red Hat Enterprise Linux 5. The Red Hat Security Response Team has rated this update as having moderate security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section. LFTP is a sophisticated file transfer program for the FTP and HTTP protocols. Like Bash, it has job control and uses the Readline library for input. It has bookmarks, built-in mirroring, and can transfer several files in parallel. It is designed with reliability in mind. It was discovered that lftp trusted the file name provided in the Content-Disposition HTTP header. A malicious HTTP server could use this flaw to write or overwrite files in the current working directory of a victim running lftp, by sending a different file from what the victim requested. (CVE-2010-2251) To correct this flaw, the following changes were made to lftp: the last seen 2020-06-01 modified 2020-06-02 plugin id 68077 published 2013-07-12 reporter This script is Copyright (C) 2013-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/68077 title Oracle Linux 5 : lftp (ELSA-2010-0585) NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-201412-08.NASL description The remote host is affected by the vulnerability described in GLSA-201412-08 (Multiple packages, Multiple vulnerabilities fixed in 2010) Vulnerabilities have been discovered in the packages listed below. Please review the CVE identifiers in the Reference section for details. Insight Perl Tk Module Source-Navigator Tk Partimage Mlmmj acl Xinit gzip ncompress liblzw splashutils GNU M4 KDE Display Manager GTK+ KGet dvipng Beanstalk Policy Mount pam_krb5 GNU gv LFTP Uzbl Slim Bitdefender Console iputils DVBStreamer Impact : A context-dependent attacker may be able to gain escalated privileges, execute arbitrary code, cause Denial of Service, obtain sensitive information, or otherwise bypass security restrictions. Workaround : There are no known workarounds at this time. last seen 2020-06-01 modified 2020-06-02 plugin id 79961 published 2014-12-15 reporter This script is Copyright (C) 2014-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/79961 title GLSA-201412-08 : Multiple packages, Multiple vulnerabilities fixed in 2010 NASL family SuSE Local Security Checks NASL id SUSE_11_0_LFTP-100610.NASL description This update of lftp improves the filename handling of downloaded files to avoid downloading arbitrary content to unexpected locations (like .login). (CVE-2010-2251) last seen 2020-06-01 modified 2020-06-02 plugin id 47120 published 2010-06-23 reporter This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/47120 title openSUSE Security Update : lftp (openSUSE-SU-2010:0334-1) NASL family Ubuntu Local Security Checks NASL id UBUNTU_USN-984-1.NASL description It was discovered that LFTP incorrectly filtered filenames suggested by Content-Disposition headers. If a user or automated system were tricked into downloading a file from a malicious site, a remote attacker could create the file with an arbitrary name, such as a dotfile, and possibly run arbitrary code. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues. last seen 2020-06-01 modified 2020-06-02 plugin id 49141 published 2010-09-08 reporter Ubuntu Security Notice (C) 2010-2019 Canonical, Inc. / NASL script (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/49141 title Ubuntu 8.04 LTS / 9.04 / 9.10 / 10.04 LTS : lftp vulnerability (USN-984-1) NASL family Mandriva Local Security Checks NASL id MANDRIVA_MDVSA-2010-128.NASL description A vulnerability has been found and corrected in lftp : The get1 command, as used by lftpget, in LFTP before 4.0.6 does not properly validate a server-provided filename before determining the destination filename of a download, which allows remote servers to create or overwrite arbitrary files via a Content-Disposition header that suggests a crafted filename, and possibly execute arbitrary code as a consequence of writing to a dotfile in a home directory (CVE-2010-2251). Packages for 2008.0 and 2009.0 are provided as of the Extended Maintenance Program. Please visit this link to learn more: http://store.mandriva.com/product_info.php?cPath=149&products_id=4 90 Additionally on 2008.0 lftp has been upgraded to 3.7.4. The updated packages have been patched to correct this issue. last seen 2020-06-01 modified 2020-06-02 plugin id 48190 published 2010-07-30 reporter This script is Copyright (C) 2010-2019 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/48190 title Mandriva Linux Security Advisory : lftp (MDVSA-2010:128) NASL family Fedora Local Security Checks NASL id FEDORA_2010-9819.NASL description CVE-2010-2251 lftp: multiple HTTP client download filename vulnerability 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 2020-06-01 modified 2020-06-02 plugin id 47566 published 2010-07-01 reporter This script is Copyright (C) 2010-2019 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/47566 title Fedora 12 : lftp-4.0.8-1.fc12 (2010-9819) NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_29B7E3F4B6A911DFAE63F255A795CB21.NASL description The get1 command, as used by lftpget, in LFTP before 4.0.6 does not properly validate a server-provided filename before determining the destination filename of a download, which allows remote servers to create or overwrite arbitrary files via a Content-Disposition header that suggests a crafted filename, and possibly execute arbitrary code as a consequence of writing to a dotfile in a home directory. last seen 2020-06-01 modified 2020-06-02 plugin id 49108 published 2010-09-04 reporter This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/49108 title FreeBSD : lftp -- multiple HTTP client download filename vulnerability (29b7e3f4-b6a9-11df-ae63-f255a795cb21) NASL family Scientific Linux Local Security Checks NASL id SL_20100802_LFTP_FOR_SL_5.NASL description LFTP is a sophisticated file transfer program for the FTP and HTTP protocols. Like Bash, it has job control and uses the Readline library for input. It has bookmarks, built-in mirroring, and can transfer several files in parallel. It is designed with reliability in mind. It was discovered that lftp trusted the file name provided in the Content-Disposition HTTP header. A malicious HTTP server could use this flaw to write or overwrite files in the current working directory of a victim running lftp, by sending a different file from what the victim requested. (CVE-2010-2251) To correct this flaw, the following changes were made to lftp: the last seen 2020-06-01 modified 2020-06-02 plugin id 60827 published 2012-08-01 reporter This script is Copyright (C) 2012-2019 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/60827 title Scientific Linux Security Update : lftp for SL 5
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References
- http://lftp.yar.ru/news.html
- http://lists.fedoraproject.org/pipermail/package-announce/2010-June/043597.html
- http://lists.opensuse.org/opensuse-security-announce/2010-08/msg00001.html
- http://marc.info/?l=oss-security&m=127411372529485&w=2
- http://marc.info/?l=oss-security&m=127432968701342&w=2
- http://marc.info/?l=oss-security&m=127611288927500&w=2
- http://marc.info/?l=oss-security&m=127620248914170&w=2
- http://secunia.com/advisories/40400
- http://wiki.rpath.com/Advisories:rPSA-2010-0073
- http://www.debian.org/security/2010/dsa-2085
- http://www.ocert.org/advisories/ocert-2010-001.html
- http://www.securityfocus.com/archive/1/514499/100/0/threaded
- http://www.vupen.com/english/advisories/2010/1654
- https://bugzilla.redhat.com/show_bug.cgi?id=591580
- https://bugzilla.redhat.com/show_bug.cgi?id=602836