Security readout for executives and security teams
Plain-English summary
On Gentoo systems running uptimed before 0.4.6-r1, a local user who can access the uptimed account may escalate to root. This is not a remote internet-facing flaw, but it can turn limited local access into full system control.
Executive priority
Treat this as high priority for multi-user Gentoo systems or environments where local compromise is plausible. It is less urgent for systems without uptimed or without local user exposure, but vulnerable hosts should still be remediated promptly.
Technical view
CVE-2020-36657 is a local privilege escalation in Gentoo's uptimed package before 0.4.6-r1. The reported cause is an unsafe recursive chown operation over /var/spool/uptimed, allowing hard-link abuse. The CVSS 3.1 score is 7.8 with local attack vector and low privileges required.
Likely exposure
Exposure appears limited to Gentoo systems using vulnerable uptimed packages before 0.4.6-r1. The provided affected-product metadata is incomplete, so confirm exposure against Gentoo package inventory and the GLSA rather than broader product assumptions.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. Exploitation requires local access and access to the uptimed user account, but successful abuse may provide root privileges.
Researcher notes
The strongest evidence is vendor-specific: Gentoo advisory and bug reference. The CVE metadata lists affected vendor/product as n/a, so avoid extrapolating to other distributions without separate evidence. Root impact is source-supported; active exploitation is not.
Mitigation direction
- Upgrade Gentoo uptimed to 0.4.6-r1 or later, per vendor guidance.
- Prioritize systems where untrusted users have local shell access.
- Restrict access to the uptimed account and related service permissions.
- Review Gentoo GLSA-202305-14 for package-specific remediation details.
Validation and detection
- Inventory Gentoo hosts running the uptimed package.
- Check installed uptimed versions against the fixed 0.4.6-r1 threshold.
- Confirm /var/spool/uptimed ownership and permissions align with vendor expectations.
- Review local accounts and service access paths to the uptimed user.
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.
CWE-59: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2020-36657 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.gentoo.org/630810CVE reference
- GLSA-202305-14CVE reference · vendor-advisory
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.