# CVE-2018-1000888: php-pear: PEAR Archive_Tar version 1.4.3 and earlier contains a CWE-502, CWE-915 vulnerability in the Archive_Tar class

CVE-2018-1000888 is fixed in php-pear on 1 platform by php-pear 1:1.10.5+submodules+notgz-1ubuntu1.18.04.1 (version 1:1.10.5+submodules+notgz-1ubuntu1.18.04.1), released December 27, 2018. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2018-1000888
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.1913
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 27, 2018

## Description

PEAR Archive_Tar version 1.4.3 and earlier contains a CWE-502, CWE-915 vulnerability in the Archive_Tar class. There are several file operations with `$v_header['filename']` as parameter (such as file_exists, is_file, is_dir, etc). When extract is called without a specific prefix path, we can trigger unserialization by crafting a tar file with `phar://[path_to_malicious_phar_file]` as path. Object injection can be used to trigger destruct in the loaded PHP classes, e.g. the Archive_Tar class itself. With Archive_Tar object injection, arbitrary file deletion can occur because `@unlink($this->_temp_tarname)` is called. If another class with useful gadget is loaded, it may possible to cause remote code execution that can result in files being deleted or possibly modified. This vulnerability appears to have been fixed in 1.4.4.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | php-pear Ubuntu 18.04.6 LTS (bionic) | 1:1.10.5+submodules+notgz-1ubuntu1.18.04.1 | [php-pear 1:1.10.5+submodules+notgz-1ubuntu1.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-php-pear-1-1.10.5-submodules-notgz-1ubuntu1.18.04.1.md) | Dec 27, 2018 |

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