CVE-2016-1885

FreeBSD 10.2 (x64) - 'amd64_set_ldt' Heap Overflow

Severity Score

6.2

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Integer signedness error in the amd64_set_ldt function in sys/amd64/amd64/sys_machdep.c in FreeBSD 9.3 before p39, 10.1 before p31, and 10.2 before p14 allows local users to cause a denial of service (kernel panic) via an i386_set_ldt system call, which triggers a heap-based buffer overflow.

Error de entero sin signo en la función amd64_set_ldt en sys/amd64/amd64/sys_machdep.c en FreeBSD 9.3 en versiones anteriores a p39, 10.1 en versiones anteriores a p31 y 10.2 en versiones anteriores a p14 permite a usuarios locales provocar una denegación de servicio (pánico en el kernel) a través de una llamada i386_set_ldt system, lo que desencadena un desbordamiento de buffer basado en memoria dinámica.

A special combination of sysarch(2) arguments, specify a request to uninstall a set of descriptors from the LDT. The start descriptor is cleared and the number of descriptors are provided. Due to invalid use of a signed intermediate value in the bounds checking during argument validity verification, unbound zero'ing of the process LDT and adjacent memory can be initiated from usermode. This vulnerability could cause the kernel to panic. In addition it is possible to perform a local Denial of Service against the system by unprivileged processes.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2016-01-13 CVE Reserved
2016-03-17 CVE Published
2016-03-17 First Exploit
2024-08-05 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

CAPEC

References (10)

URL	Tag	Source
http://seclists.org/fulldisclosure/2016/Mar/56	Mailing List
http://seclists.org/fulldisclosure/2016/Mar/67	Mailing List
http://www.coresecurity.com/advisories/freebsd-kernel-amd64setldt-heap-overflow	X_refsource_misc
http://www.securityfocus.com/archive/1/537812/100/0/threaded	Mailing List
http://www.securityfocus.com/archive/1/537813/100/0/threaded	Mailing List
http://www.securitytracker.com/id/1035309	Vdb Entry

URL	Date	SRC
https://packetstorm.news/files/id/136276	2016-03-17
https://www.exploit-db.com/exploits/39570	2024-08-05
http://packetstormsecurity.com/files/136276/FreeBSD-Kernel-amd64_set_ldt-Heap-Overflow.html	2024-08-05

URL	Date	SRC

URL	Date	SRC
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:15.sysarch.asc	2018-10-09

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				9.3 Search vendor "Freebsd" for product "Freebsd" and version "9.3"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.1 Search vendor "Freebsd" for product "Freebsd" and version "10.1"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				10.2 Search vendor "Freebsd" for product "Freebsd" and version "10.2"		-		Affected