FreeBSD 9.3/10.1/10.2/10.3 Keyboard Driver memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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7.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in FreeBSD 9.3/10.1/10.2/10.3. Impacted is an unknown function of the component Keyboard Driver. Performing a manipulation results in memory corruption. This vulnerability was named CVE-2016-1886. The attack needs to be approached locally. In addition, an exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability classified as critical has been found in FreeBSD 9.3/10.1/10.2/10.3 (Operating System). This affects an unknown functionality of the component Keyboard Driver. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. The advisory summarizes:

The atkbd(4) driver, together with the atkbdc(4) driver, provides access to the AT 84 keyboard or the AT enhanced keyboard which is connected to the AT keyboard controller. The driver is required for the console driver syscons(4) or vt(4). The driver exposes its own ioctl(2) interface to allow it to be configured from userland through the kbdcontrol(1) utility.

The weakness was presented 05/17/2016 as FreeBSD-SA-16:18.atkbd as confirmed advisory (Website). It is possible to read the advisory at security.FreeBSD.org. This vulnerability is uniquely identified as CVE-2016-1886 since 01/13/2016. The exploitability is told to be easy. Attacking locally is a requirement. The successful exploitation needs a authentication. Technical details are unknown but a public exploit is available. The advisory points out:

Incorrect signedness comparison in the ioctl(2) handler allows a malicious local user to overwrite a portion of the kernel memory.

The exploit is shared for download at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 92923 (FreeBSD : FreeBSD -- Buffer overflow in keyboard driver (7bbc0e8c-600a-11e6-a6c3-14dae9d210b8)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family FreeBSD Local Security Checks and running in the context l.

Applying a patch is able to eliminate this problem. It is possible to mitigate the problem by applying the configuration setting sysctl hw.kbd.keymap_restrict_change=4. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (44211), Tenable (92923), SecurityFocus (BID 90734†) and SecurityTracker (ID 1035905†). See VDB-87544 for similar entry. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.4

VulDB Base Score: 7.8
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 92923
Nessus Name: FreeBSD : FreeBSD -- Buffer overflow in keyboard driver (7bbc0e8c-600a-11e6-a6c3-14dae9d210b8)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 802738
OpenVAS Name: Junos Buffer Overflow Vulnerability
OpenVAS File: 🔍
OpenVAS Family: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Config: sysctl hw.kbd.keymap_restrict_change=4

Timelineinfo

01/13/2016 🔍
05/17/2016 +125 days 🔍
05/17/2016 +0 days 🔍
05/17/2016 +0 days 🔍
05/18/2016 +1 days 🔍
05/19/2016 +1 days 🔍
05/25/2016 +6 days 🔍
08/12/2016 +79 days 🔍
07/06/2024 +2885 days 🔍

Sourcesinfo

Product: freebsd.org

Advisory: FreeBSD-SA-16:18.atkbd
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-1886 (🔍)
GCVE (CVE): GCVE-0-2016-1886
GCVE (VulDB): GCVE-100-87543
SecurityFocus: 90734 - FreeBSD CVE-2016-1886 Local Buffer Overflow Vulnerability
SecurityTracker: 1035905

scip Labs: https://www.scip.ch/en/?labs.20161013
See also: 🔍

Entryinfo

Created: 05/19/2016 10:57
Updated: 07/06/2024 20:27
Changes: 05/19/2016 10:57 (71), 12/02/2018 09:54 (12), 08/21/2022 11:35 (3), 07/06/2024 20:27 (24)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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