CVE-2018-1000888

Impact:
Moderate
Public Date:
2018-12-28
CWE:
CWE-502
Bugzilla:
1669615: CVE-2018-1000888 php-pear: Unsafe deserialization of data in Archive_Tar class

The MITRE CVE dictionary describes this issue as:

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.

Find out more about CVE-2018-1000888 from the MITRE CVE dictionary dictionary and NIST NVD.

Statement

This issue affects the versions of php-pear as shipped with Red Hat Enterprise Linux 6 and 7.

Red Hat Enterprise Linux 6 is now in Maintenance Support 2 Phase of the support and maintenance life cycle. This has been rated as having a security impact of Moderate, and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

This issue did not affect the versions of php-pear as shipped with Red Hat Enterprise Linux 5.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 8.1
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity Impact High
Availability Impact High

Affected Packages State

Platform Package State
Red Hat Software Collections for Red Hat Enterprise Linux rh-php71-php-pear Affected
Red Hat Software Collections for Red Hat Enterprise Linux rh-php70-php-pear Affected
Red Hat Software Collections for Red Hat Enterprise Linux rh-php72-php-pear Affected
Red Hat Enterprise Linux 8 php-pear Affected
Red Hat Enterprise Linux 7 php-pear Affected
Red Hat Enterprise Linux 6 php-pear Will not fix
Red Hat Enterprise Linux 5 php-pear Not affected
Last Modified

CVE description copyright © 2017, The MITRE Corporation