Vulnerability Details : CVE-2021-31566
An improper link resolution flaw can occur while extracting an archive leading to changing modes, times, access control lists, and flags of a file outside of the archive. An attacker may provide a malicious archive to a victim user, who would trigger this flaw when trying to extract the archive. A local attacker may use this flaw to gain more privileges in a system.
Products affected by CVE-2021-31566
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:*
- Redhat » Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions » Version: 8.6cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.6:*:*:*:*:*:*:*
- cpe:2.3:a:redhat:codeready_linux_builder:-:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*
- cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*
- cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:libarchive:libarchive:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-31566
0.03%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-31566
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2021-31566
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Primary)
References for CVE-2021-31566
-
https://lists.debian.org/debian-lts-announce/2022/11/msg00030.html
[SECURITY] [DLA 3202-1] libarchive security updateMailing List;Third Party Advisory
-
https://access.redhat.com/security/cve/CVE-2021-31566
cve-detailsThird Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=2024237
2024237 – (CVE-2021-31566) CVE-2021-31566 libarchive: symbolic links incorrectly followed when changing modes, times, ACL and flags of a file while extracting an archiveIssue Tracking;Patch;Third Party Advisory
-
https://github.com/libarchive/libarchive/commit/b41daecb5ccb4c8e3b2c53fd6147109fc12c3043
Do not follow symlinks when processing the fixup list · libarchive/libarchive@b41daec · GitHubPatch;Third Party Advisory
-
https://github.com/libarchive/libarchive/issues/1566
[SECURITY] Processing fixup entries may follow symbolic links · Issue #1566 · libarchive/libarchive · GitHubIssue Tracking;Patch;Third Party Advisory
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