National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-20835 Detail

Current Description

A vulnerability was found in tar-fs before 1.16.2. An Arbitrary File Overwrite issue exists when extracting a tarball containing a hardlink to a file that already exists on the system, in conjunction with a later plain file with the same name as the hardlink. This plain file content replaces the existing file content.

Source:  MITRE
Description Last Modified:  04/30/2019
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.5 HIGH
Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N (V3 legend)
Impact Score: 3.6
Exploitability Score: 3.9


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

CVSS v2.0 Severity and Metrics:

Base Score: 6.4 MEDIUM
Vector: (AV:N/AC:L/Au:N/C:N/I:P/A:P) (V2 legend)
Impact Subscore: 4.9
Exploitability Subscore: 10.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): None
Confidentiality (C): None
Integrity (I): Partial
Availability (A): Partial
Additional Information:
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://github.com/mafintosh/tar-fs/commit/06672828e6fa29ac8551b1b6f36c852a9a3c58a2 Patch Third Party Advisory
https://github.com/mafintosh/tar-fs/compare/d590fc7...a35ce2f Patch Third Party Advisory
https://hackerone.com/reports/344595 Exploit Third Party Advisory

Technical Details

Vulnerability Type (View All)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:tar-fs_project:tar-fs:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (excluding)
1.16.2


Change History

1 change record found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-20835
NVD Published Date:
04/30/2019
NVD Last Modified:
05/03/2019