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arr-pm vulnerable to arbitrary shell execution when extracting or listing files contained in a malicious rpm.

High severity GitHub Reviewed Published Sep 19, 2022 in jordansissel/ruby-arr-pm • Updated Jan 31, 2023

Package

bundler arr-pm (RubyGems)

Affected versions

< 0.0.12

Patched versions

0.0.12

Description

Impact

Arbitrary shell execution is possible when using RPM::File#files and RPM::File#extract if the RPM contains a malicious "payload compressor" field.

This vulnerability impacts the extract and files methods of the RPM::File class in the affected versions of this library.

Patches

Version 0.0.12 is available with a fix for these issues.

Workarounds

When using an affected version of this library (arr-pm), ensure any RPMs being processed contain valid/known payload compressor values. Such values include: gzip, bzip2, xz, zstd, and lzma.

You can check the payload compressor field in an rpm by using the rpm command line tool. For example:

% rpm -qp example-1.0-1.x86_64.rpm --qf "%{PAYLOADCOMPRESSOR}\n"
gzip

Impact on known dependent projects

This library is used by fpm. The vulnerability may impact fpm only when using the flag -s rpm or --input-type rpm to convert a malicious rpm to another format. It does not impact creating rpms.

References

Credit

Thanks to @joernchen for reporting this problem and contributing to the resolution :)

For more information

If you have any questions or comments about this advisory:

References

@jordansissel jordansissel published to jordansissel/ruby-arr-pm Sep 19, 2022
Published to the GitHub Advisory Database Sep 21, 2022
Reviewed Sep 21, 2022
Published by the National Vulnerability Database Sep 21, 2022
Last updated Jan 31, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Local
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS score

0.129%
(49th percentile)

Weaknesses

CVE ID

CVE-2022-39224

GHSA ID

GHSA-88cv-mj24-8w3q

Source code

Credits

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