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.
Version 0.0.12 is available with a fix for these issues.
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
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.
Thanks to @joernchen for reporting this problem and contributing to the resolution :)
If you have any questions or comments about this advisory: * Open an issue in the arr-pm issue tracker
{ "nvd_published_at": "2022-09-21T23:15:00Z", "github_reviewed_at": "2022-09-21T17:00:12Z", "severity": "HIGH", "github_reviewed": true, "cwe_ids": [ "CWE-78" ] }