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CVE-2019-11050— Use-after-free in exif parsing under memory sanitizer

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。EXIF extension是其中的一个用于读取和编写图像元数据的扩展。 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EXIF extension存在存在缓冲区错误漏洞。该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的

CVSS 4.8 · Medium EPSS 7.62% · P94

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2019-11050

Vulnerability Information
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Vulnerability Title
Use-after-free in exif parsing under memory sanitizer
Source: CVE Program / CVE List V5
Vulnerability Description
When PHP EXIF extension is parsing EXIF information from an image, e.g. via exif_read_data() function, in PHP versions 7.2.x below 7.2.26, 7.3.x below 7.3.13 and 7.4.0 it is possible to supply it with data what will cause it to read past the allocated buffer. This may lead to information disclosure or crash.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
PHP EXIF extension 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。EXIF extension是其中的一个用于读取和编写图像元数据的扩展。 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EXIF extension存在存在缓冲区错误漏洞。该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的
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-2019-11050

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III. Intelligence Information for CVE-2019-11050

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Vendor Advisories for CVE-2019-11050 (4)

Mailing List Discussions for CVE-2019-11050 (7)

Other References for CVE-2019-11050 (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-2019-11044 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
CVE-2019-11046 3.7 LOW Buffer underflow in bc_shift_addsub

IV. Related Vulnerabilities

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

V. Comments for CVE-2019-11050

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