CVE-2011-1075Public exploit

File hash equality disclosure via privileged pathname race

Published Oct 19, 2021 · Updated Aug 6, 2024

Race condition in FreeBSD crontab allows local users to compare MD5 hashes of arbitrary unreadable files through a temporary-file race. MD5File hashes a user-controlled pathname with effective UID 0 after inode checks, allowing symlink replacement to redirect two privileged reads. Successful use requires a local account, hard-link and symlink manipulation, and winning two narrow timing windows; it reveals only whether chosen files have equal hashes.

CVSS severity3.7
Low
EPSS probability0.76%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in FreeBSD crontab allows local users to compare MD5 hashes of arbitrary unreadable files through a temporary-file race. MD5File hashes a user-controlled pathname with effective UID 0 after inode checks, allowing symlink replacement to redirect two privileged reads. Successful use requires a local account, hard-link and symlink manipulation, and winning two narrow timing windows; it reveals only whether chosen files have equal hashes.

The record

CVE
CVE-2011-1075
Published
Oct 19, 2021
Updated
Aug 6, 2024
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-362
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 19, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=unknown

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=unknown

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:P/I:N/A:N
3.7NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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