CVE-2018-20482

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).

CVSS v3.0 4.7 MEDIUM
CVSS v2.0 1.9 LOW

4.7^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 1.0 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

1.9^/10

CVSS v2.0 : LOW

Vector : AV:L/AC:M/Au:N/C:N/I:N/A:P

Exploitability : 3.4 / Impact : 2.9

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug	Patch Third Party Advisory
https://twitter.com/thatcks/status/1076166645708668928	Patch Third Party Advisory
https://news.ycombinator.com/item?id=18745431	Exploit Third Party Advisory
http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html	Mailing List Third Party Advisory
http://www.securityfocus.com/bid/106354	Third Party Advisory VDB Entry
http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454	Patch Third Party Advisory
https://security.gentoo.org/glsa/201903-05	Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html	Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00025.html	Mailing List Third Party Advisory

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Configurations

Configuration 1 (hide)

cpe:2.3:a:gnu:tar:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:debian:debian_linux:8.0:::::::*
	cpe:2.3:o:debian:debian_linux:9.0:::::::*

Configuration 3 (hide)

cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*

Information

Published : 2018-12-26 10:29

Updated : 2021-11-30 11:52

NVD link : CVE-2018-20482

Mitre link : CVE-2018-20482

JSON object : View

CWE

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

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Products Affected

debian

debian_linux

gnu

tar

opensuse

leap

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