Vulnerability Monitor

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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).

Published

2018-12-26T18:29:00.373

Last Modified

2024-11-21T04:01:34.323

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 4.7 (MEDIUM)

CVSSv2 Vector

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

Access Vector: LOCAL
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

3.4

Impact Score

2.9

Weaknesses

Type: Primary
CWE-835

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	gnu	tar	≤ 1.30	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	opensuse	leap	15.0	Yes

References

http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454 Patch, Third Party Advisory ([email protected])
http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html Third Party Advisory ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html Mailing List, Third Party Advisory ([email protected])
http://www.securityfocus.com/bid/106354 Third Party Advisory, VDB Entry ([email protected])
https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html Mailing List, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2021/11/msg00025.html Mailing List, Third Party Advisory ([email protected])
https://news.ycombinator.com/item?id=18745431 Exploit, Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/201903-05 Third Party Advisory ([email protected])
https://twitter.com/thatcks/status/1076166645708668928 Patch, Third Party Advisory ([email protected])
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug Patch, Third Party Advisory ([email protected])
http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/106354 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2018/12/msg00023.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2021/11/msg00025.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://news.ycombinator.com/item?id=18745431 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201903-05 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://twitter.com/thatcks/status/1076166645708668928 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://utcc.utoronto.ca/~cks/space/blog/sysadmin/TarFindingTruncateBug Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)