CVE-2020-15704

pppd arbitrary file read information disclosure vulnerability

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The modprobe child process in the ./debian/patches/load_ppp_generic_if_needed patch file incorrectly handled module loading. A local non-root attacker could exploit the MODPROBE_OPTIONS environment variable to read arbitrary root files. Fixed in 2.4.5-5ubuntu1.4, 2.4.5-5.1ubuntu2.3+esm2, 2.4.7-1+2ubuntu1.16.04.3, 2.4.7-2+2ubuntu1.3, 2.4.7-2+4.1ubuntu5.1, 2.4.7-2+4.1ubuntu6. Was ZDI-CAN-11504.

El proceso hijo modprobe en el archivo de parche ./debian/patches/load_ppp_generic_if_needed manejó incorrectamente la carga del módulo. Un atacante local que no sea root podría explotar la variable de entorno MODPROBE_OPTIONS para leer archivos root arbitrarios. Corregido en las versiones 2.4.5-5ubuntu1.4, 2.4.5-5.1ubuntu2.3+esm2, 2.4.7-1+2ubuntu1.16.04.3, 2.4.7-2+2ubuntu1.3, 2.4.7-2+4.1ubuntu5.1, 2.4.7-2+4.1ubuntu6. Fue ZDI-CAN-11504

This vulnerability allows local attackers to read arbitrary files on affected installations of Canonical Ubuntu. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of environment variables in pppd. The issue results from the lack of proper validation of user-supplied data, which can allow the read of arbitrary files. An attacker can leverage this vulnerability to disclose stored credentials, leading to further compromise.

*Credits: Thomas Chauchefoin working with Trend Micro's Zero Day Initiative

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-07-14 CVE Reserved
2020-08-05 CVE Published
2024-07-28 EPSS Updated
2024-09-17 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-20: Improper Input Validation
CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://ubuntu.com/security/notices/USN-4451-1	2021-11-18
https://ubuntu.com/security/notices/USN-4451-2	2021-11-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Canonical Search vendor "Canonical"	Ppp Search vendor "Canonical" for product "Ppp"	< 2.4.7-1\+ubuntu1.16.04.3 Search vendor "Canonical" for product "Ppp" and version " < 2.4.7-1\+ubuntu1.16.04.3"	-	Affected	in	Canonical Search vendor "Canonical"	Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"	16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"	lts	Safe
Canonical Search vendor "Canonical"	Ppp Search vendor "Canonical" for product "Ppp"	< 2.4.7-2\+2ubuntu1.3 Search vendor "Canonical" for product "Ppp" and version " < 2.4.7-2\+2ubuntu1.3"	-	Affected	in	Canonical Search vendor "Canonical"	Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"	18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"	lts	Safe
Canonical Search vendor "Canonical"	Ppp Search vendor "Canonical" for product "Ppp"	< 2.4.7-2\+4.1ubuntu5.1 Search vendor "Canonical" for product "Ppp" and version " < 2.4.7-2\+4.1ubuntu5.1"	-	Affected	in	Canonical Search vendor "Canonical"	Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"	20.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "20.04"	lts	Safe
Canonical Search vendor "Canonical"	Ppp Search vendor "Canonical" for product "Ppp"	< 2.4.5-5ubuntu1.4 Search vendor "Canonical" for product "Ppp" and version " < 2.4.5-5ubuntu1.4"	-	Affected	in	Canonical Search vendor "Canonical"	Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"	12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"	esm	Safe
Canonical Search vendor "Canonical"	Ppp Search vendor "Canonical" for product "Ppp"	< 2.4.5-5.1ubuntu2.3\+esm2 Search vendor "Canonical" for product "Ppp" and version " < 2.4.5-5.1ubuntu2.3\+esm2"	-	Affected	in	Canonical Search vendor "Canonical"	Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"	14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"	esm	Safe