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CVE-2020-7065— mb_strtolower (UTF-32LE): stack-buffer-overflow at php_unicode_tolower_full

Quick assessment

Affected
PHP Group PHP
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PHP（PHP：Hypertext Preprocessor，PHP：超文本预处理器）是PHPGroup和开放源代码社区的共同维护的一种开源的通用计算机脚本语言。该语言主要用于Web开发，支持多种数据库及操作系统。 PHP 7.3.16之前的7.3.x版本和7.4.4之前的7.4.x版本中存在缓冲区错误漏洞。攻击者可利用该漏洞导致内存损坏，崩溃以及代码执行。

CVSS 7.4 · High EPSS 4.88% · P92

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2020-7065

Vulnerability Information
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Vulnerability Title
mb_strtolower (UTF-32LE): stack-buffer-overflow at php_unicode_tolower_full
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions 7.3.x below 7.3.16 and 7.4.x below 7.4.4, while using mb_strtolower() function with UTF-32LE encoding, certain invalid strings could cause PHP to overwrite stack-allocated buffer. This could lead to memory corruption, crashes and potentially code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP（PHP：Hypertext Preprocessor，PHP：超文本预处理器）是PHPGroup和开放源代码社区的共同维护的一种开源的通用计算机脚本语言。该语言主要用于Web开发，支持多种数据库及操作系统。 PHP 7.3.16之前的7.3.x版本和7.4.4之前的7.4.x版本中存在缓冲区错误漏洞。攻击者可利用该漏洞导致内存损坏，崩溃以及代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
PHP Group PHP 7.3.x ~ 7.3.16 -

II. Public POCs for CVE-2020-7065

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III. Intelligence Information for CVE-2020-7065

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Vendor Advisories for CVE-2020-7065 (3)

Other References for CVE-2020-7065 (3)

Same Patch Batch · PHP Group · 2020-04-01 · 3 CVEs total

CVE-2020-7064 6.5 MEDIUM Use-of-uninitialized-value in exif
CVE-2020-7066 5.3 MEDIUM get_headers() silently truncates after a null byte

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-121

V. Comments for CVE-2020-7065

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