National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-20482 Detail

Current Description

GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to cause a denial of service (infinite read loop in sparse_dump_region in sparse.c) by modifying a file that is supposed to be archived by a different user's process (e.g., a system backup running as root).

Source:  MITRE
Description Last Modified:  12/26/2018
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 4.7 MEDIUM
Vector: AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H (V3 legend)
Impact Score: 3.6
Exploitability Score: 1.0


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

CVSS v2.0 Severity and Metrics:

Base Score: 1.9 LOW
Vector: (AV:L/AC:M/Au:N/C:N/I:N/A:P) (V2 legend)
Impact Subscore: 2.9
Exploitability Subscore: 3.4


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

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454 Patch Third Party Advisory
http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html Third Party Advisory
http://www.securityfocus.com/bid/106354 Third Party Advisory VDB Entry
https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html Mailing List Third Party Advisory
https://news.ycombinator.com/item?id=18745431 Exploit Third Party Advisory
https://twitter.com/thatcks/status/1076166645708668928 Patch Third Party Advisory
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug Patch Third Party Advisory

Technical Details

Vulnerability Type (View All)

Change History

4 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-20482
NVD Published Date:
12/26/2018
NVD Last Modified:
02/14/2019