Headline
GHSA-88cv-mj24-8w3q: arr-pm vulnerable to arbitrary shell execution when extracting or listing files contained in a malicious rpm.
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
- https://github.com/jordansissel/ruby-arr-pm/pull/14
- https://github.com/jordansissel/ruby-arr-pm/pull/15
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:
- Open an issue in the arr-pm issue tracker
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
- jordansissel/ruby-arr-pm#14
- jordansissel/ruby-arr-pm#15
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:
- Open an issue in the arr-pm issue tracker
References
- GHSA-88cv-mj24-8w3q
- jordansissel/ruby-arr-pm#14
- jordansissel/ruby-arr-pm#15
Related news
Arr-pm is an RPM reader/writer library written in Ruby. Versions prior to 0.0.12 are subject to OS command injection resulting in shell execution if the RPM contains a malicious "payload compressor" field. This vulnerability impacts the `extract` and `files` methods of the `RPM::File` class of this library. Version 0.0.12 patches these issues. A workaround for this issue is to ensure any RPMs being processed contain valid/known payload compressor values such as gzip, bzip2, xz, zstd, and lzma. The payload compressor field in an rpm can be checked by using the rpm command line tool.