Security readout for executives and security teams
Plain-English summary
CVE-2001-0905 is an old procmail flaw affecting version 3.20 and earlier when installed setuid. A local user could abuse a signal-handling race condition to crash service behavior or potentially gain root privileges. This is mainly a risk for legacy Unix/Linux mail-processing systems that still run vulnerable procmail configurations.
Executive priority
Treat as a targeted legacy-risk item, not a broad internet emergency. Prioritize if the organization still operates multi-user Unix/Linux mail systems, shell servers, or old appliances using procmail setuid. If procmail is absent or not setuid, urgency is materially lower.
Technical view
The issue is a race condition in procmail signal handling. If procmail 3.20 or earlier runs setuid, a local attacker can send a signal while a signal handler is already executing, causing denial of service or possible root privilege escalation. The provided sources do not include CVSS, CWE, patch details, or confirmed exploit activity.
Likely exposure
Exposure is likely limited to legacy systems using procmail 3.20 or earlier with setuid permissions. Modern systems may not include procmail, may use patched distribution packages, or may not run it setuid. Validate actual package version and file permissions before assuming risk.
Exploitation context
The attack requires local user access. The source bundle does not indicate remote exploitation, active exploitation, or CISA KEV listing. Business impact is highest on shared shell, mail, hosting, or legacy Unix systems where untrusted users can execute local programs.
Researcher notes
Evidence is sparse and historical. The CVE description and IBM X-Force reference identify procmail 3.20 and earlier, setuid execution, local signal-race conditions, denial of service, and possible root privileges. No patch version, proof-of-concept status, or exploitation evidence is provided in the supplied sources.
Mitigation direction
- Inventory systems for procmail installations and versions.
- Prioritize systems running procmail 3.20 or earlier.
- Check whether procmail is installed with setuid permissions.
- Apply vendor or operating-system package guidance for remediation.
- Remove procmail or setuid exposure where not required.
Validation and detection
- Confirm whether procmail is present on managed Unix/Linux hosts.
- Record installed procmail version from trusted package inventory.
- Review file permissions to determine whether procmail runs setuid.
- Check vendor advisories or package changelogs for CVE-2001-0905 coverage.
- Prioritize shared-user systems for faster validation.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2001-0905 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- procmail-signal-handling-race(6872)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.