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CVE-2021-21704— Multiple vulnerabilities in Firebird client extension

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.

EasyApache是Apache基金会的一个功能强大且易于使用的工具，内置在WHM/cPanel中，可以使用它来更新和配置Apache web服务器。 EasyApache 存在安全漏洞，该漏洞源于EasyApache中PDO_Firebird的缓冲区溢出。攻击者可利用该漏洞触发拒绝服务，并可能运行代码。

CVSS 5.0 · Medium EPSS 1.80% · P78
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I. Basic Information for CVE-2021-21704

Vulnerability Information
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Vulnerability Title
Multiple vulnerabilities in Firebird client extension
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions 7.3.x below 7.3.29, 7.4.x below 7.4.21 and 8.0.x below 8.0.8, when using Firebird PDO driver extension, a malicious database server could cause crashes in various database functions, such as getAttribute(), execute(), fetch() and others by returning invalid response data that is not parsed correctly by the driver. This can result in crashes, denial of service or potentially memory corruption.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
EasyApache 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
EasyApache是Apache基金会的一个功能强大且易于使用的工具，内置在WHM/cPanel中，可以使用它来更新和配置Apache web服务器。 EasyApache 存在安全漏洞，该漏洞源于EasyApache中PDO_Firebird的缓冲区溢出。攻击者可利用该漏洞触发拒绝服务，并可能运行代码。
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 ~ 7.3.29 -

II. Public POCs for CVE-2021-21704

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III. Intelligence Information for CVE-2021-21704

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Vendor Advisories for CVE-2021-21704 (2)

Other References for CVE-2021-21704 (3)

Same Patch Batch · PHP Group · 2021-10-04 · 3 CVEs total

CVE-2021-21706 5.3 MEDIUM ZipArchive::extractTo may extract outside of destination dir
CVE-2021-21705 4.3 MEDIUM Incorrect URL validation in FILTER_VALIDATE_URL

IV. Related Vulnerabilities

Same product: PHP
Same vendor: PHP Group
Same weakness: CWE-125

V. Comments for CVE-2021-21704

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