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CVE-2020-3812 is a local information-disclosure vulnerability in qmail-verify as used by netqmail 1.06. qmail-verify performs file-existence checks while running with root privileges and does not drop privileges before accessing attacker-controlled locations in a user home directory. A local attacker can use a symbolic link to cause the privileged process to test files or directories otherwise inaccessible to that user, then infer whether the target exists from the program response.
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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.
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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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local information disclosure in qmail-verify where a local attacker can test for the existence of files and directories because qmail-verify runs as root and checks paths without dropping privileges first.
An information-disclosure flaw in a mail program that retains root privileges while accessing a file, allowing symlink-based probing of root-readable file existence.
An information-disclosure issue in a mail program that retains root privileges while accessing a user-controlled symlink target, allowing existence checks on root-readable files.
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.