CVE-2009-4146

FreeBSD 8.0 Run-Time Link-Editor (RTLD) - Local Privilege Escalation

Severity Score

7.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The _rtld function in the Run-Time Link-Editor (rtld) in libexec/rtld-elf/rtld.c in FreeBSD 7.1, 7.2, and 8.0 does not clear the LD_PRELOAD environment variable, which allows local users to gain privileges by executing a setuid or setguid program with a modified LD_PRELOAD variable containing an untrusted search path that points to a Trojan horse library, a different vector than CVE-2009-4147.

La función _rtld en el Run-Time Link-Editor (rtld) de libexec/rtld-elf/rtld.c de FreeBSD v7.1, v7.2 y v8.0, no limpia la variable de entorno LD_PRELOAD, esto permite a usuarios locales aumentar sus privilegios al ejecutar el programa setuid o setguid con la variable LD_PRELOAD modificada para que contenga una ruta de búsqueda no confiable que apunte a una biblioteca de un Troyano. Se trata de una vulnerabilidad diferente de CVE-2009-4147.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2009-11-30 First Exploit
2009-12-01 CVE Reserved
2009-12-02 CVE Published
2024-08-07 CVE Updated
2025-03-30 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-264: Permissions, Privileges, and Access Controls

CAPEC

References (15)

URL	Tag	Source
http://packetstormsecurity.com/files/152997/FreeBSD-rtld-execl-Privilege-Escalation.html	X_refsource_misc
http://www.securityfocus.com/archive/1/508142/100/0/threaded	Mailing List
http://www.securityfocus.com/archive/1/508146/100/0/threaded	Mailing List
http://www.securityfocus.com/archive/1/508168/100/0/threaded	Mailing List
http://www.securitytracker.com/id?1023250	Vdb Entry
https://seclists.org/fulldisclosure/2009/Nov/371
https://c-skills.blogspot.com/2009/11/always-check-return-value.html
https://lists.freebsd.org/pipermail/freebsd-announce/2009-December/001286.html
https://xorl.wordpress.com/2009/12/01/freebsd-ld_preload-security-bypass
https://securitytracker.com/id/1023250

URL	Date	SRC
https://packetstorm.news/files/id/152997	2019-05-22
https://www.exploit-db.com/exploits/10255	2009-11-30
http://people.freebsd.org/~cperciva/rtld.patch	2024-08-07
http://www.securityfocus.com/bid/37154	2024-08-07

URL	Date	SRC

URL	Date	SRC
http://secunia.com/advisories/37517	2019-05-22

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"				7.1 Search vendor "Freebsd" for product "Freebsd" and version "7.1"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				7.2 Search vendor "Freebsd" for product "Freebsd" and version "7.2"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				8.0 Search vendor "Freebsd" for product "Freebsd" and version "8.0"		-		Affected