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CVE-2019-11046— Buffer underflow in bc_shift_addsub

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 7.2.26之前的7.2.x版本、7.3.13之前的7.3.x版本和7.4.0版本中的bcmath扩展功能存在缓冲区错误漏洞。攻击者可借助特制字符串利用该漏洞获取某些内存位置的内容。

CVSS 3.7 · Low EPSS 4.12% · P91

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2019-11046

Vulnerability Information
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Vulnerability Title
Buffer underflow in bc_shift_addsub
Source: CVE Program / CVE List V5
Vulnerability Description
In PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13 and 7.4.0, PHP bcmath extension functions on some systems, including Windows, can be tricked into reading beyond the allocated space by supplying it with string containing characters that are identified as numeric by the OS but aren't ASCII numbers. This can read to disclosure of the content of some memory locations.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
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 7.2.26之前的7.2.x版本、7.3.13之前的7.3.x版本和7.4.0版本中的bcmath扩展功能存在缓冲区错误漏洞。攻击者可借助特制字符串利用该漏洞获取某些内存位置的内容。
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 7.2.x ~ 7.2.26 -

II. Public POCs for CVE-2019-11046

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III. Intelligence Information for CVE-2019-11046

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Vendor Advisories for CVE-2019-11046 (5)

Mailing List Discussions for CVE-2019-11046 (7)

Other References for CVE-2019-11046 (2)

Same Patch Batch · PHP Group · 2019-12-23 · 6 CVEs total

CVE-2019-11049 6.5 MEDIUM mail() may release string with refcount==1 twice
CVE-2019-11047 4.8 MEDIUM Heap-buffer-overflow READ in exif
CVE-2019-11050 4.8 MEDIUM Use-after-free in exif parsing under memory sanitizer
CVE-2019-11044 3.7 LOW link() silently truncates after a null byte on Windows
CVE-2019-11045 3.7 LOW DirectoryIterator class silently truncates after a null byte

IV. Related Vulnerabilities

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