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CVE

CVE-2018-20482

GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local users to c

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).

MEDIUM · CVSS 4.7 EPSS 0.0002
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
▤

Affected Products & Versions

3
gnu tar<= 1.30
debian linuxall versions
opensuse leapall versions
⚠

Public Exploits & PoCs

1
pocnews.ycombinator.com · item?id=18745431news.ycombinator.com
▣

Scoring & Timeline

4.7
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD26 Dec 2018 · 06:29 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

9
suse-csafopenSUSE-SU-2024:11422-1
siemens-csafSSA-398330
suse-csafSUSE-SU-2022:1548-1
usnUSN-4692-1
suse-csafSUSE-SU-2020:2806-1
🔗

References & Sources

9
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://git.savannah.gnu.org/cgit/tar.git/commit/?id=c15c42ccd1e2377945fd0414eca1a49294bff454PatchThird Party Advisory
http://lists.gnu.org/archive/html/bug-tar/2018-12/msg00023.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00077.htmlMailing ListThird Party Advisory
http://www.securityfocus.com/bid/106354Third Party AdvisoryVDB Entry
https://lists.debian.org/debian-lts-announce/2018/12/msg00023.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00025.htmlMailing ListThird Party Advisory
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