CVE-2009-4147

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 and 8.0 does not clear the (1) LD_LIBMAP, (2) LD_LIBRARY_PATH, (3) LD_LIBMAP_DISABLE, (4) LD_DEBUG, and (5) LD_ELF_HINTS_PATH environment variables, which allows local users to gain privileges by executing a setuid or setguid program with a modified variable containing an untrusted search path that points to a Trojan horse library, different vectors than CVE-2009-4146.

La función _rtld en Run-Time Link-Editor (rtld) en libexec/rtld-elf/rtld.c en FreeBSD v7.1 y v8.0 no limpia las variables de entorno de (1) LD_LIBMAP, (2) LD_LIBRARY_PATH, (3) LD_LIBMAP_DISABLE, (4) LD_DEBUG, and (5) LD_ELF_HINTS_PATH lo que permite a usuarios locales conseguir privilegios mediante la ejecución de un programa setuid o setguid con una variable modificada que contiene una ruta de búsqueda sin confianza que apunta a una libreria de un troyano con vectores diferentes que CVE-2009-4146.

*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 (14)

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
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://www.securityfocus.com/bid/37154	2024-08-07

URL	Date	SRC
http://people.freebsd.org/~cperciva/rtld.patch	2019-05-22
http://www.securitytracker.com/id?1023250	2019-05-22

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