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CVE-2018-1000888

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-3857-1
Posted Jan 15, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3857-1 - Fariskhi Vidyan discovered that PEAR Archive_Tar incorrectly handled certain archive paths. A remote attacker could possibly use this issue to execute arbitrary code.

tags | advisory, remote, arbitrary
systems | linux, ubuntu
advisories | CVE-2018-1000888
MD5 | 0216917c7cb3ac850f31adf9b107774b
PEAR Archive_Tar PHP Object Injection
Posted Jan 10, 2019
Authored by farisv

PEAR Archive_Tar versions prior to 1.4.4 suffers from a php object injection vulnerability.

tags | exploit, php
advisories | CVE-2018-1000888
MD5 | 301d1addd2f16d82750f17ee54102420
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