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osvGoogleOSV:GHSA-7R3H-M5J6-3Q42
HistoryAug 18, 2022 - 7:01 p.m.

@actions/core has Delimiter Injection Vulnerability in exportVariable

2022-08-1819:01:36
Google
osv.dev
23
vulnerability
delimiter injection
@actions/core
upgrate
workaround
user input
environment variable
github_env
workflow
action
author

CVSS3

5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

EPSS

0.001

Percentile

19.4%

Impact

The core.exportVariable function uses a well known delimiter that attackers can use to break out of that specific variable and assign values to other arbitrary variables. Workflows that write untrusted values to the GITHUB_ENV file may cause the path or other environment variables to be modified without the intention of the workflow or action author.

Patches

Users should upgrade to @actions/core v1.9.1.

Workarounds

If you are unable to upgrade the @actions/core package, you can modify your action to ensure that any user input does not contain the delimiter _GitHubActionsFileCommandDelimeter_ before calling core.exportVariable.

References

More information about setting-an-environment-variable in workflows

If you have any questions or comments about this advisory:

CVSS3

5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N

EPSS

0.001

Percentile

19.4%