CVE-2018-1000888
CVSS v3
8.8
HIGH
EPSS Score
29.5 %
exploit probability
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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.
Technical details
- Published
- 2018-12-28
- Exploit-DB
- EDB-46108
Frequently asked questions
What is 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.
Is CVE-2018-1000888 actively exploited?
Active exploitation of CVE-2018-1000888 has not been confirmed. The EPSS score is 29.5%, indicating the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2018-1000888?
CVE-2018-1000888 has a CVSS v3 base score of 8.8 (HIGH severity).
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