CVE-2018-20482
1.9 Low
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:N/I:N/A:P
4.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.6 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%
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).
Affected configurations
References
git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454
lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html
lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html
www.securityfocus.com/bid/106354
lists.debian.org/debian-lts-announce/2018/12/msg00023.html
lists.debian.org/debian-lts-announce/2021/11/msg00025.html
news.ycombinator.com/item?id=18745431
security.gentoo.org/glsa/201903-05
twitter.com/thatcks/status/1076166645708668928
utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug
Related
1.9 Low
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:M/Au:N/C:N/I:N/A:P
4.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.6 Medium
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
5.1%