CVE-2021-23177
An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of the target of the link.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.39%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
An improper link resolution flaw while extracting an archive can lead to changing the access control list (ACL) of the target of the link. 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 change the ACL of a file on the system and gain more privileges.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 0.39% probability · 32th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-59
- Affected
- libarchive/libarchive · fedoraproject/fedora · redhat/enterprise linux · redhat/enterprise linux eus · redhat/enterprise linux for ibm z systems · redhat/enterprise linux for ibm z systems eus · redhat/enterprise linux for power little endian · redhat/enterprise linux for power little endian eus · redhat/enterprise linux server aus · redhat/enterprise linux server for power little endian update services for sap solutions · redhat/enterprise linux server tus · redhat/codeready linux builder · debian/debian linux
- Source
- secalert@redhat.com
References
- https://access.redhat.com/security/cve/CVE-2021-23177Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024245Issue Tracking, Patch, Third Party Advisory
- https://github.com/libarchive/libarchive/commit/fba4f123cc456d2b2538f811bb831483bf336badPatch, Third Party Advisory
- https://github.com/libarchive/libarchive/issues/1565Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00030.htmlMailing List, Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2021-23177Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2024245Issue Tracking, Patch, Third Party Advisory
- https://github.com/libarchive/libarchive/commit/fba4f123cc456d2b2538f811bb831483bf336badPatch, Third Party Advisory
- https://github.com/libarchive/libarchive/issues/1565Issue Tracking, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/11/msg00030.htmlMailing List, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.