Vulnerabilities > CVE-2016-1886 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in Freebsd
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
Integer signedness error in the genkbd_commonioctl function in sys/dev/kbd/kbd.c in FreeBSD 9.3 before p42, 10.1 before p34, 10.2 before p17, and 10.3 before p3 allows local users to obtain sensitive information from kernel memory, cause a denial of service (memory overwrite and kernel crash), or gain privileges via a negative value in the flen structure member in the arg argument in a SETFKEY ioctl call, which triggers a "two way heap and stack overflow."
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| OS | 4 |
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.
- 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.
Exploit-Db
| description | FreeBSD Kernel (FreeBSD 10.2 < 10.3 x64) - 'SETFKEY' (PoC). CVE-2016-1886. Dos exploit for FreeBSD_x86-64 platform |
| id | EDB-ID:44211 |
| last seen | 2018-02-28 |
| modified | 2016-05-29 |
| published | 2016-05-29 |
| reporter | Exploit-DB |
| source | https://www.exploit-db.com/download/44211/ |
| title | FreeBSD Kernel (FreeBSD 10.2 < 10.3 x64) - 'SETFKEY' (PoC) |
Nessus
NASL family Firewalls NASL id PFSENSE_SA-16_04.NASL description According to its self-reported version number, the remote pfSense install is prior to 2.3.1. It is, therefore, affected by multiple vulnerabilities. last seen 2020-04-30 modified 2018-01-31 plugin id 106500 published 2018-01-31 reporter This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof. source https://www.tenable.com/plugins/nessus/106500 title pfSense < 2.3.1 Multiple Vulnerabilities (SA-16_03 / SA-16-04) code # # (C) Tenable Network Security, Inc. # include("compat.inc"); if (description) { script_id(106500); script_version("1.11"); script_set_attribute(attribute:"plugin_modification_date", value:"2020/04/27"); script_cve_id( "CVE-2016-1886", "CVE-2016-1887", "CVE-2016-2105", "CVE-2016-2106", "CVE-2016-2107", "CVE-2016-2109", "CVE-2016-2176" ); script_bugtraq_id( 87940, 89744, 89746, 89757, 89760, 90734 ); script_xref(name:"EDB-ID", value:"39768"); script_xref(name:"EDB-ID", value:"44212"); script_xref(name:"FreeBSD", value:"SA-16:17.openssl"); script_xref(name:"FreeBSD", value:"SA-16:18.atkbd"); script_xref(name:"FreeBSD", value:"SA-16:19.sendmsg"); script_name(english:"pfSense < 2.3.1 Multiple Vulnerabilities (SA-16_03 / SA-16-04)"); script_summary(english:"Checks the version of pfSense."); script_set_attribute(attribute:"synopsis", value: "The remote firewall host is affected by multiple vulnerabilities."); script_set_attribute(attribute:"description", value: "According to its self-reported version number, the remote pfSense install is prior to 2.3.1. It is, therefore, affected by multiple vulnerabilities."); script_set_attribute(attribute:"see_also", value:"https://doc.pfsense.org/index.php/2.3.1_New_Features_and_Changes"); # https://www.pfsense.org/security/advisories/pfSense-SA-16_03.webgui.asc script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?434aa389"); # https://www.pfsense.org/security/advisories/pfSense-SA-16_04.filterlog.asc script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f5d9b668"); script_set_attribute(attribute:"solution", value: "Upgrade to pfSense version 2.3.1 or later."); script_set_cvss_base_vector("CVSS2#AV:L/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:L/AC:L/PR:L/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-2016-2109"); script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available"); script_set_attribute(attribute:"exploit_available", value:"true"); script_set_attribute(attribute:"exploit_framework_core", value:"true"); script_set_attribute(attribute:"vuln_publication_date", value:"2016/05/09"); script_set_attribute(attribute:"patch_publication_date", value:"2016/05/09"); script_set_attribute(attribute:"plugin_publication_date", value:"2018/01/31"); script_set_attribute(attribute:"plugin_type", value:"remote"); script_set_attribute(attribute:"cpe", value:"cpe:/a:pfsense:pfsense"); script_set_attribute(attribute:"cpe", value:"cpe:/a:bsdperimeter:pfsense"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_family(english:"Firewalls"); script_copyright(english:"This script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof."); script_dependencies("pfsense_detect.nbin"); script_require_keys("Host/pfSense"); exit(0); } include("vcf.inc"); include("vcf_extras.inc"); if (!get_kb_item("Host/pfSense")) audit(AUDIT_HOST_NOT, "pfSense"); app_info = vcf::pfsense::get_app_info(); constraints = [ { "fixed_version" : "2.3.1"} ]; vcf::pfsense::check_version_and_report( app_info:app_info, constraints:constraints, severity:SECURITY_HOLE, flags:{xss:TRUE} );NASL family FreeBSD Local Security Checks NASL id FREEBSD_PKG_7BBC0E8C600A11E6A6C314DAE9D210B8.NASL description Incorrect signedness comparison in the ioctl(2) handler allows a malicious local user to overwrite a portion of the kernel memory. Impact : A local user may crash the kernel, read a portion of kernel memory and execute arbitrary code in kernel context. The result of executing an arbitrary kernel code is privilege escalation. last seen 2020-06-01 modified 2020-06-02 plugin id 92923 published 2016-08-12 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/92923 title FreeBSD : FreeBSD -- Buffer overflow in keyboard driver (7bbc0e8c-600a-11e6-a6c3-14dae9d210b8)