Vulnerabilities > CVE-2013-3266 - Improper Input Validation vulnerability in Freebsd
Attack vector
UNKNOWN Attack complexity
UNKNOWN Privileges required
UNKNOWN Confidentiality impact
UNKNOWN Integrity impact
UNKNOWN Availability impact
UNKNOWN Summary
The nfsrvd_readdir function in sys/fs/nfsserver/nfs_nfsdport.c in the new NFS server in FreeBSD 8.0 through 9.1-RELEASE-p3 does not verify that a READDIR request is for a directory node, which allows remote attackers to cause a denial of service (memory corruption) or possibly execute arbitrary code by specifying a plain file instead of a directory.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 6 |
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 Debian Local Security Checks NASL id DEBIAN_DSA-2672.NASL description Adam Nowacki discovered that the new FreeBSD NFS implementation processes a crafted READDIR request which instructs to operate a file system on a file node as if it were a directory node, leading to a kernel crash or potentially arbitrary code execution. The kfreebsd-8 kernel in the oldstable distribution (squeeze) does not enable the new NFS implementation. The Linux kernel is not affected by this vulnerability. last seen 2020-03-17 modified 2013-05-23 plugin id 66548 published 2013-05-23 reporter This script is Copyright (C) 2013-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/66548 title Debian DSA-2672-1 : kfreebsd-9 - interpretation conflict code #%NASL_MIN_LEVEL 80502 # # (C) Tenable Network Security, Inc. # # The descriptive text and package checks in this plugin were # extracted from Debian Security Advisory DSA-2672. The text # itself is copyright (C) Software in the Public Interest, Inc. # include("compat.inc"); if (description) { script_id(66548); script_version("1.4"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/03/12"); script_cve_id("CVE-2013-3266"); script_bugtraq_id(59585); script_xref(name:"DSA", value:"2672"); script_name(english:"Debian DSA-2672-1 : kfreebsd-9 - interpretation conflict"); script_summary(english:"Checks dpkg output for the updated package"); script_set_attribute( attribute:"synopsis", value:"The remote Debian host is missing a security-related update." ); script_set_attribute( attribute:"description", value: "Adam Nowacki discovered that the new FreeBSD NFS implementation processes a crafted READDIR request which instructs to operate a file system on a file node as if it were a directory node, leading to a kernel crash or potentially arbitrary code execution. The kfreebsd-8 kernel in the oldstable distribution (squeeze) does not enable the new NFS implementation. The Linux kernel is not affected by this vulnerability." ); script_set_attribute( attribute:"see_also", value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=706414" ); script_set_attribute( attribute:"see_also", value:"https://packages.debian.org/source/wheezy/kfreebsd-9" ); script_set_attribute( attribute:"see_also", value:"https://www.debian.org/security/2013/dsa-2672" ); script_set_attribute( attribute:"solution", value: "Upgrade the kfreebsd-9 packages. For the stable distribution (wheezy), this problem has been fixed in version 9.0-10+deb70.1." ); 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:U/RL:OF/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:kfreebsd-9"); script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0"); script_set_attribute(attribute:"patch_publication_date", value:"2013/05/22"); script_set_attribute(attribute:"plugin_publication_date", value:"2013/05/23"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2013-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_family(english:"Debian Local Security Checks"); script_dependencies("ssh_get_info.nasl"); script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l"); exit(0); } include("audit.inc"); include("debian_package.inc"); if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED); if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian"); if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING); flag = 0; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9-486", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9-686", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9-686-smp", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9-amd64", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9-malta", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9-xen", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9.0-2", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9.0-2-486", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9.0-2-686", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9.0-2-686-smp", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9.0-2-amd64", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9.0-2-malta", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-headers-9.0-2-xen", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9-486", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9-686", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9-686-smp", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9-amd64", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9-malta", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9-xen", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9.0-2-486", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9.0-2-686", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9.0-2-686-smp", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9.0-2-amd64", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9.0-2-malta", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-image-9.0-2-xen", reference:"9.0-10+deb70.1")) flag++; if (deb_check(release:"7.0", prefix:"kfreebsd-source-9.0", reference:"9.0-10+deb70.1")) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get()); else security_hole(0); exit(0); } else audit(AUDIT_HOST_NOT, "affected");NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_E66A6E2FB0D511E291640016E6DCB562.NASL description Insufficient input validation in the NFS server allows an attacker to cause the underlying file system to treat a regular file as a directory. last seen 2020-06-01 modified 2020-06-02 plugin id 66264 published 2013-04-30 reporter This script is Copyright (C) 2013-2018 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/66264 title FreeBSD : FreeBSD -- NFS remote denial of service (e66a6e2f-b0d5-11e2-9164-0016e6dcb562) 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(66264); script_version("1.7"); script_cvs_date("Date: 2018/11/10 11:49:43"); script_cve_id("CVE-2013-3266"); script_bugtraq_id(59585); script_xref(name:"FreeBSD", value:"SA-13:05.nfsserver"); script_name(english:"FreeBSD : FreeBSD -- NFS remote denial of service (e66a6e2f-b0d5-11e2-9164-0016e6dcb562)"); 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: "Insufficient input validation in the NFS server allows an attacker to cause the underlying file system to treat a regular file as a directory." ); # https://vuxml.freebsd.org/freebsd/e66a6e2f-b0d5-11e2-9164-0016e6dcb562.html script_set_attribute( attribute:"see_also", value:"http://www.nessus.org/u?41d5af59" ); 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:U/RL:OF/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); 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:"2013/04/21"); script_set_attribute(attribute:"patch_publication_date", value:"2013/04/29"); script_set_attribute(attribute:"plugin_publication_date", value:"2013/04/30"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2013-2018 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>=8.3<8.3_8")) flag++; if (pkg_test(save_report:TRUE, pkg:"FreeBSD>=9.1<9.1_3")) 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");
References
- http://secunia.com/advisories/53241
- http://secunia.com/advisories/53241
- http://www.debian.org/security/2013/dsa-2672
- http://www.debian.org/security/2013/dsa-2672
- http://www.freebsd.org/security/advisories/FreeBSD-SA-13:05.nfsserver.asc
- http://www.freebsd.org/security/advisories/FreeBSD-SA-13:05.nfsserver.asc
- http://www.securitytracker.com/id/1028491
- http://www.securitytracker.com/id/1028491