Amazon Linux 2 Security Advisory: ALAS-2019-1159
Advisory Release Date: 2019-02-13 18:35 Pacific
Advisory Updated Date: 2019-02-14 04:03 Pacific
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.(CVE-2018-1000888)
Affected Packages:
php-pear
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update php-pear to update your system.
noarch:
php-pear-1.10.7-3.amzn2.0.1.noarch
src:
php-pear-1.10.7-3.amzn2.0.1.src