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CVE-2021-32751

Опубликовано: 20 июл. 2021
Источник: redhat
CVSS3: 7.5
EPSS Низкий

Описание

Gradle is a build tool with a focus on build automation. In versions prior to 7.2, start scripts generated by the application plugin and the gradlew script are both vulnerable to arbitrary code execution when an attacker is able to change environment variables for the user running the script. This may impact those who use gradlew on Unix-like systems or use the scripts generated by Gradle in thieir application on Unix-like systems. For this vulnerability to be exploitable, an attacker needs to be able to set the value of particular environment variables and have those environment variables be seen by the vulnerable scripts. This issue has been patched in Gradle 7.2 by removing the use of eval and requiring the use of the bash shell. There are a few workarounds available. For CI/CD systems using the Gradle build tool, one may ensure that untrusted users are unable to change environment variables for the user that executes gradlew. If one is unable to upgrade to Gradle 7.2, one may generate a new gradlew script with Gradle 7.2 and use it for older versions of Gradle. Fpplications using start scripts generated by Gradle, one may ensure that untrusted users are unable to change environment variables for the user that executes the start script. A vulnerable start script could be manually patched to remove the use of eval or the use of environment variables that affect the application's command-line. If the application is simple enough, one may be able to avoid the use of the start scripts by running the application directly with Java command.

A flaw was found in Gradle, which allows a remote, authenticated attacker to execute arbitrary code on the system caused by a flaw in start and gradlew. By sending specially crafted environment variables, an attacker can execute arbitrary code on the system.

Отчет

To exploit this vulnerability, an attacker needs to be able to set the value of particular environment variables and have those environment variables be seen by the vulnerable scripts. This requirement makes this CVE of a Moderate impact.

Меры по смягчению последствий

CI/CD systems using the Gradle build tool

  • You are not vulnerable if untrusted users are unable to change environment variables for the user that executes gradlew.
  • If you are unable to upgrade to Gradle 7.2, you can generate a new gradlew script with Gradle 7.2 and use it for older versions of Gradle. Applications using start scripts generated by Gradle
  • You are not vulnerable if untrusted users are unable to change environment variables for the user that executes the start script.
  • If you are unsure, the vulnerable start script could be manually patched to remove the use of eval or the use of environment variables that affect the application's command-line.
  • If the application is simple enough, you may be able to avoid the use of the start scripts by running the application directly with the Java command.

Затронутые пакеты

ПлатформаПакетСостояниеРекомендацияРелиз
Red Hat JBoss Enterprise Application Platform 6gradleOut of support scope
Red Hat JBoss Enterprise Application Platform 7gradleNot affected
Red Hat JBoss Enterprise Application Platform Expansion PackgradleNot affected
Red Hat Software Collectionsrh-maven36-byte-buddyWill not fix

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Дополнительная информация

Статус:

Moderate
Дефект:
CWE-78
https://bugzilla.redhat.com/show_bug.cgi?id=2239392gradle: Arbitrary code execution via specially crafted environment variables

EPSS

Процентиль: 49%
0.00257
Низкий

7.5 High

CVSS3

Связанные уязвимости

CVSS3: 7.5
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больше 4 лет назад

Gradle is a build tool with a focus on build automation. In versions prior to 7.2, start scripts generated by the `application` plugin and the `gradlew` script are both vulnerable to arbitrary code execution when an attacker is able to change environment variables for the user running the script. This may impact those who use `gradlew` on Unix-like systems or use the scripts generated by Gradle in thieir application on Unix-like systems. For this vulnerability to be exploitable, an attacker needs to be able to set the value of particular environment variables and have those environment variables be seen by the vulnerable scripts. This issue has been patched in Gradle 7.2 by removing the use of `eval` and requiring the use of the `bash` shell. There are a few workarounds available. For CI/CD systems using the Gradle build tool, one may ensure that untrusted users are unable to change environment variables for the user that executes `gradlew`. If one is unable to upgrade to Gradle 7.2...

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EPSS

Процентиль: 49%
0.00257
Низкий

7.5 High

CVSS3