CVE-2018-1000888
PEAR Archive_Tar version 1.4.3 and earlier contains a CWE-502, CWE-915 vulnerability in the Archive_Tar class.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 19.1%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.0
- 8.8 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 19.13% probability · 97th percentile
- Public exploits
- 1 in Exploit-DB · first 10 January 2019
- CISA KEV
- Not listed
- Weakness
- CWE-502
- Affected
- php/pear archive tar · canonical/ubuntu linux · debian/debian linux
- Source
- cve@mitre.org
EPSS 19.1% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
References
- https://blog.ripstech.com/2018/new-php-exploitation-technique/Exploit, Third Party Advisory
- https://cdn2.hubspot.net/hubfs/3853213/us-18-Thomas-It%27s-A-PHP-Unserialization-Vulnerability-Jim-But-Not-As-We-....pdfExploit, Technical Description, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/02/msg00020.htmlThird Party Advisory
- https://pear.php.net/bugs/bug.php?id=23782Broken Link, Third Party Advisory
- https://pear.php.net/package/Archive_Tar/download/Broken Link, Third Party Advisory
- https://security.gentoo.org/glsa/202006-14
- https://usn.ubuntu.com/3857-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4378Third Party Advisory
- https://www.exploit-db.com/exploits/46108/Exploit, Third Party Advisory, VDB Entry
- https://blog.ripstech.com/2018/new-php-exploitation-technique/Exploit, Third Party Advisory
- https://cdn2.hubspot.net/hubfs/3853213/us-18-Thomas-It%27s-A-PHP-Unserialization-Vulnerability-Jim-But-Not-As-We-....pdfExploit, Technical Description, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/02/msg00020.htmlThird Party Advisory
- https://pear.php.net/bugs/bug.php?id=23782Broken Link, Third Party Advisory
- https://pear.php.net/package/Archive_Tar/download/Broken Link, Third Party Advisory
- https://security.gentoo.org/glsa/202006-14
- https://usn.ubuntu.com/3857-1/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4378Third Party Advisory
- https://www.exploit-db.com/exploits/46108/Exploit, Third Party Advisory, VDB Entry
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.