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CVE-2021-29428— Local privilege escalation through system temporary directory

Quick assessment

Affected
gradle gradle
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.

Gradle是美国Gradle公司的一套基于JVM的项目构建工具，它支持maven、Ivy仓库等。 Gradle 7.0之前版本存在安全漏洞，该漏洞允许多个用户在其中创建和删除文件的打开权限来创建系统临时目录。

CVSS 8.8 · High EPSS 0.54% · P45

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
gradle gradle < 7.0 affected
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I. Basic Information for CVE-2021-29428

Vulnerability Information
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Vulnerability Title
Local privilege escalation through system temporary directory
Source: CVE Program / CVE List V5
Vulnerability Description
In Gradle before version 7.0, on Unix-like systems, the system temporary directory can be created with open permissions that allow multiple users to create and delete files within it. Gradle builds could be vulnerable to a local privilege escalation from an attacker quickly deleting and recreating files in the system temporary directory. This vulnerability impacted builds using precompiled script plugins written in Kotlin DSL and tests for Gradle plugins written using ProjectBuilder or TestKit. If you are on Windows or modern versions of macOS, you are not vulnerable. If you are on a Unix-like operating system with the "sticky" bit set on your system temporary directory, you are not vulnerable. The problem has been patched and released with Gradle 7.0. As a workaround, on Unix-like operating systems, ensure that the "sticky" bit is set. This only allows the original user (or root) to delete a file. If you are unable to change the permissions of the system temporary directory, you can move the Java temporary directory by setting the System Property `java.io.tmpdir`. The new path needs to limit permissions to the build user only. For additional details refer to the referenced GitHub Security Advisory.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在具有不安全权限的目录中创建临时文件
Source: CVE Program / CVE List V5
Vulnerability Title
Gradle 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gradle是美国Gradle公司的一套基于JVM的项目构建工具，它支持maven、Ivy仓库等。 Gradle 7.0之前版本存在安全漏洞，该漏洞允许多个用户在其中创建和删除文件的打开权限来创建系统临时目录。
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
gradle gradle < 7.0 -

II. Public POCs for CVE-2021-29428

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III. Intelligence Information for CVE-2021-29428

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Patches & Fixes for CVE-2021-29428 (1)

Vendor Advisories for CVE-2021-29428 (1)

Other References for CVE-2021-29428 (1)

IV. Related Vulnerabilities

Same product: gradle
Same vendor: gradle
Same weakness: CWE-379

V. Comments for CVE-2021-29428

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