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CVE-2021-23177 is an improper link-resolution vulnerability in libarchive before version 3.5.2 on Linux. During archive extraction, libarchive applies ACLs through acl_set_file() without first ensuring that the archive entry is not a symbolic link. Because Linux does not support ACLs on symbolic links, ACL application follows the link and modifies the ACLs of the symlink target. A crafted archive can therefore cause ACL changes to an unintended local file when extracted.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown; the advisory identifies it as addressed but provides no vulnerability description.
Unknown; the advisory lists this CVE without a vulnerability description.
Included in this Migration Toolkit for Containers security-update advisory; no vulnerability details are provided in the content.
Security vulnerability addressed in the Red Hat Advanced Cluster Management for Kubernetes 2.4.3 erratum; no technical detail is provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.