CVE-2009-4146

FreeBSD rtld execl() Privilege Escalation

Severity Score

7.2

*CVSS v2

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

CVSS Scores

NISTv2 7.2

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
2023-03-08 EPSS Updated
2024-08-07 CVE 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://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
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/freebsd/local/rtld_execl_priv_esc.rb	2009-11-30

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