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CVE-2024-2757— PHP mb_encode_mimeheader runs endlessly for some inputs

Quick assessment

Affected
PHP Group PHP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

PHP是一种在服务器端执行的脚本语言。 PHP 8.3.*版本至8.3.5之前版本存在安全漏洞，该漏洞源于对于某些包含非空格字符后跟空格的长字符串的输入，函数 mb_encode_mimeheader会无限运行。

CVSS 7.5 · High EPSS 1.92% · P79

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-2757

Vulnerability Information
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Vulnerability Title
PHP mb_encode_mimeheader runs endlessly for some inputs
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP 8.3.* before 8.3.5, function mb_encode_mimeheader() runs endlessly for some inputs that contain long strings of non-space characters followed by a space. This could lead to a potential DoS attack if a hostile user sends data to an application that uses this function.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
PHP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
PHP是一种在服务器端执行的脚本语言。 PHP 8.3.*版本至8.3.5之前版本存在安全漏洞，该漏洞源于对于某些包含非空格字符后跟空格的长字符串的输入，函数 mb_encode_mimeheader会无限运行。
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 8.3.* ~ 8.3.5 -

II. Public POCs for CVE-2024-2757

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III. Intelligence Information for CVE-2024-2757

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Vendor Advisories for CVE-2024-2757 (1)

Mailing List Discussions for CVE-2024-2757 (1)

Same Patch Batch · PHP Group · 2024-04-29 · 4 CVEs total

CVE-2024-1874 9.4 CRITICAL Command injection via array-ish $command parameter of proc_open()
CVE-2024-2756 6.5 MEDIUM __Host-/__Secure- cookie bypass due to partial CVE-2022-31629 fix
CVE-2024-3096 6.5 MEDIUM PHP function password_verify can erroneously return true when argument contains NUL

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group

V. Comments for CVE-2024-2757

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