CVE-2020-7062

Null Pointer Dereference in PHP Session Upload Progress

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

In PHP versions 7.2.x below 7.2.28, 7.3.x below 7.3.15 and 7.4.x below 7.4.3, when using file upload functionality, if upload progress tracking is enabled, but session.upload_progress.cleanup is set to 0 (disabled), and the file upload fails, the upload procedure would try to clean up data that does not exist and encounter null pointer dereference, which would likely lead to a crash.

En PHP versiones 7.2.x por debajo de 7.2.28, versiones 7.3.x por debajo de 7.3.15 y versiones 7.4.x por debajo de 7.4.3, cuando es usada la funcionalidad de carga de archivos, si el seguimiento de progreso de carga está habilitado, pero session.upload_progress.cleanup está ajustado en 0 (deshabilitado), y la carga del archivo presenta un fallo, el procedimiento de carga intentaría limpiar los datos que no existan y encontraría una desreferencia del puntero null, lo que probablemente conllevaría a un bloqueo.

*Credits: Reported by ryat@php.net

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-01-15 CVE Reserved
2020-02-27 CVE Published
2024-06-12 EPSS Updated
2024-09-16 CVE Updated
2024-09-16 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (10)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2020/03/msg00034.html	Mailing List
https://www.tenable.com/security/tns-2021-14	Third Party Advisory

URL	Date	SRC
https://bugs.php.net/bug.php?id=79221	2024-09-16

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00023.html	2022-01-01
https://security.gentoo.org/glsa/202003-57	2022-01-01
https://usn.ubuntu.com/4330-1	2022-01-01
https://www.debian.org/security/2020/dsa-4717	2022-01-01
https://www.debian.org/security/2020/dsa-4719	2022-01-01
https://access.redhat.com/security/cve/CVE-2020-7062	2020-12-01
https://bugzilla.redhat.com/show_bug.cgi?id=1808532	2020-12-01

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				>= 7.2.0 <= 7.2.27 Search vendor "Php" for product "Php" and version " >= 7.2.0 <= 7.2.27"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				>= 7.3.0 <= 7.3.14 Search vendor "Php" for product "Php" and version " >= 7.3.0 <= 7.3.14"		-		Affected
Php Search vendor "Php"		Php Search vendor "Php" for product "Php"				>= 7.4.0 <= 7.4.2 Search vendor "Php" for product "Php" and version " >= 7.4.0 <= 7.4.2"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
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"		-		Affected
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		Affected
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"		esm		Affected
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		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				19.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "19.10"		-		Affected