CVE-2018-1000888: Pear/archive tar Security Vulnerability Vulnerability

HIGH
Advisory Identifier: GHSA-3q76-jq6m-573p
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CVSS 8.8
Published
Advisory Summary

CVE-2018-1000888 is a HIGH (CVSS 8.8) security vulnerability vulnerability (General Security Weakness) affecting Pear/archive tar libraries in the Packagist ecosystem. The issue involves //. Remediation is available by upgrading affected packages to version 1.4.4.

CVE-2018-1000888 at a Glance

CVE Identifier CVE-2018-1000888
GHSA Identifier GHSA-3q76-jq6m-573p
Severity HIGH
CVSS v3.1 Base Score 8.8
CWE Classification General Security Weakness
Affected Product Pear/archive tar
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 8.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction Required (UI:R)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2018-1000888

To remediate this vulnerability, upgrade all affected Pear/archive tar dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

pear/archive_tar fixed: 1.4.4 
Upgrade pear/archive_tar to 1.4.4
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for pear/archive_tar

How to Check if You Are Affected

To determine whether your application is affected by CVE-2018-1000888, inspect your project dependencies for Pear/archive tar:

inspect dependencies for pear/archive_tar

Analyze the terminal output to locate any version of Pear/archive tar in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.4.4), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under General Security Weakness. In Pear/archive tar, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

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.

CVE-2018-1000888 Affected Pear/archive tar Versions

1 component(s)
Fixed Versions:
1.4.4
Product / Package Ecosystem Affected Versions Fixed Version
pear/archive_tar
 Packagist
< 1.4.4
1.4.4

References

NVD — CVE-2018-1000888 NVD
https://nvd.nist.gov/vuln/detail/CVE-2018-1000888
Security Fix Commit FIX COMMIT
https://github.com/pear/Archive_Tar/commit/59ace120ac5ceb5f0d36e40e48e1884de1badf76
Pear/archive tar Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/pear/archive_tar/CVE-2018-1000888.yaml
Pear/archive tar Source Repository REPOSITORY
https://github.com/pear/Archive_Tar
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2019/02/msg00020.html
pear.php.net/bugs/bug.php WEB
https://pear.php.net/bugs/bug.php?id=23782
Pear/archive tar Security Information SECURITY
https://security.gentoo.org/glsa/202006-14
usn.ubuntu.com/3857-1 WEB
https://usn.ubuntu.com/3857-1
web.archive.org/web/20210328115328/... WEB
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
web.archive.org/web/20220524160841/... WEB
https://web.archive.org/web/20220524160841/https://blog.sonarsource.com/new-php-exploitation-technique?redirect=rips
Pear/archive tar Security Information SECURITY
https://www.debian.org/security/2019/dsa-4378
www.exploit-db.com/exploits/46108 WEB
https://www.exploit-db.com/exploits/46108

Frequently Asked Questions

What is CVE-2018-1000888?
CVE-2018-1000888 is a security vulnerability in Pear/archive tar involving // under General Security Weakness.
Which Pear/archive tar versions are affected?
Affected versions include releases prior to 1.4.4 across affected packages: pear/archive_tar.
What version fixes CVE-2018-1000888?
Upgrading to 1.4.4 (or the latest patched release for your respective branch) resolves the vulnerability.
Is pear/archive_tar affected?
Yes, pear/archive_tar is affected in releases prior to 1.4.4. Upgrade your dependency to 1.4.4 or later.
What is the CVSS score of CVE-2018-1000888?
CVE-2018-1000888 has a CVSS v3.1 base score of 8.8 (HIGH) with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2018-1000888?
CVE-2018-1000888 is classified under General Security Weakness.
How can I check Packagist dependencies for CVE-2018-1000888?
Run the dependency tree command: 'inspect dependencies for pear/archive_tar'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-3q76-jq6m-573p",
  "modified" : "2023-07-07T13:42:43Z",
  "published" : "2023-07-07T13:42:43Z",
  "aliases" : [ "CVE-2018-1000888" ],
  "summary" : "Archive_Tar contains Potential RCE if filename starts with phar://",
  "details" : "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.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Packagist",
      "name" : "pear/archive_tar"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.4.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2018-1000888"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/pear/Archive_Tar/commit/59ace120ac5ceb5f0d36e40e48e1884de1badf76"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/pear/archive_tar/CVE-2018-1000888.yaml"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/pear/Archive_Tar"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2019/02/msg00020.html"
  }, {
    "type" : "WEB",
    "url" : "https://pear.php.net/bugs/bug.php?id=23782"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/202006-14"
  }, {
    "type" : "WEB",
    "url" : "https://usn.ubuntu.com/3857-1"
  }, {
    "type" : "WEB",
    "url" : "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"
  }, {
    "type" : "WEB",
    "url" : "https://web.archive.org/web/20220524160841/https://blog.sonarsource.com/new-php-exploitation-technique?redirect=rips"
  }, {
    "type" : "WEB",
    "url" : "https://www.debian.org/security/2019/dsa-4378"
  }, {
    "type" : "WEB",
    "url" : "https://www.exploit-db.com/exploits/46108"
  } ],
  "database_specific" : {
    "cwe_ids" : [ ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-07-07T13:42:43Z",
    "nvd_published_at" : null
  }
}