CVE-2018-1000888

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
php-pear	18.10 cosmic	Fixed 1:1.10.5+submodules+notgz-1ubuntu1.18.10.1
	18.04 LTS bionic	Fixed 1:1.10.5+submodules+notgz-1ubuntu1.18.04.1
	16.04 LTS xenial	Fixed 1:1.10.1+submodules+notgz-6ubuntu0.1
	14.04 LTS trusty	Not in release

Notes

mdeslaur

the 1.4.4 release broke symlinks, see: https://pear.php.net/bugs/bug.php?id=23788 1.4.5 was released with symlink fix the regression is unrelated to the fix for this CVE

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
php-pear	Upstream: 59ace12

Severity score breakdown

Parameter	Value
Base score	8.8 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-3857-1
PEAR vulnerability
14 January 2019