Home/CVE/systemd through v245 mishandles numerical usernames such as ones composed of decimal digits or 0x followed by hex digits
CVE

CVE-2020-13776

systemd through v245 mishandles numerical usernames such as ones composed of decimal digits or 0x followed by hex digits

systemd through v245 mishandles numerical usernames such as ones composed of decimal digits or 0x followed by hex digits, as demonstrated by use of root privileges when privileges of the 0x0 user account were intended. NOTE: this issue exists because of an incomplete fix for CVE-2017-1000082.

MEDIUM · CVSS 6.7 EPSS 0.00137
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules1 YARA rules0
⬡

Weakness Classification

CWE-269Improper Privilege Management
CWE-269Improper Privilege Management
▤

Affected Products & Versions

4
systemd project systemd<= 245
netapp active iq unified managerall versions
netapp solidfire \& hci management nodeall versions
fedoraproject fedoraall versions
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumSystemd Service Creation
▣

Scoring & Timeline

6.7
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD03 Jun 2020 · 03:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

5
siemens-csafSSA-398330
msrcCVE-2020-13776
rhsaRHSA-2021:1611Moderate
rhsaRHSA-2021:3900Moderate
cisa-csafcisa-csaf-csaf_files-OT-white-2023-icsa-23-348-10
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/systemd/systemd/issues/15985Issue TrackingPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IYGLFEKG45EYBJ7TPQMLWROWPTZBEU63/
https://security.netapp.com/advisory/ntap-20200611-0003/Third Party Advisory
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