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Security Advisories: GSA_kwCzR0hTQS0zcTc2LWpxNm0tNTczcM4AA0fJ

Archive_Tar contains Potential RCE if filename starts with phar://

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.

Permalink: https://github.com/advisories/GHSA-3q76-jq6m-573p
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0zcTc2LWpxNm0tNTczcM4AA0fJ
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 10 months ago
Updated: 10 months ago

CVSS Score: 8.8
CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Identifiers: GHSA-3q76-jq6m-573p, CVE-2018-1000888
References:

• https://nvd.nist.gov/vuln/detail/CVE-2018-1000888
• https://github.com/pear/Archive_Tar/commit/59ace120ac5ceb5f0d36e40e48e1884de1badf76
• https://github.com/FriendsOfPHP/security-advisories/blob/master/pear/archive_tar/CVE-2018-1000888.yaml
• https://lists.debian.org/debian-lts-announce/2019/02/msg00020.html
• https://pear.php.net/bugs/bug.php?id=23782
• https://security.gentoo.org/glsa/202006-14
• https://usn.ubuntu.com/3857-1/
• https://web.archive.org/web/20210328115328/https://cdn2.hubspot.net/hubfs/3853213/us-18-Thomas-It's-A-PHP-Unserialization-Vulnerability-Jim-But-Not-As-We-....pdf
• https://web.archive.org/web/20220524160841/https://blog.sonarsource.com/new-php-exploitation-technique?redirect=rips
• https://www.debian.org/security/2019/dsa-4378
• https://www.exploit-db.com/exploits/46108/
• https://github.com/advisories/GHSA-3q76-jq6m-573p

Repository: https://github.com/pear/Archive_Tar
Blast Radius: 32.4

Affected Packages