Home/CVE/A local (authenticated) low-privileged user can exploit a behavior in an ESET installer to achieve arbitrary file overwr
CVE

CVE-2020-26941

A local (authenticated) low-privileged user can exploit a behavior in an ESET installer to achieve arbitrary file overwr

A local (authenticated) low-privileged user can exploit a behavior in an ESET installer to achieve arbitrary file overwrite (deletion) of any file via a symlink, due to insecure permissions. The possibility of exploiting this vulnerability is limited and can only take place during the installation phase of ESET products. Furthermore, exploitation can only succeed when Self-Defense is disabled. Affected products are: ESET NOD32 Antivirus, ESET Internet Security, ESET Smart Security, ESET Smart Security Premium versions 13.2 and lower.

ESET Endpoint Antivirus, ESET Endpoint Security, ESET NOD32 Antivirus Business Edition, ESET Smart Security Business Edition versions 7.3 and lower.

ESET File Security for Microsoft Windows Server, ESET Mail Security for Microsoft Exchange Server, ESET Mail Security for IBM Domino, ESET Security for Kerio, ESET Security for Microsoft SharePoint Server versions 7.2 and lower.

MEDIUM · CVSS 5.5 EPSS 0.00073
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules6 YARA rules0
⬡

Weakness Classification

CWE-276Incorrect Default Permissions
▤

Affected Products & Versions

11
eset endpoint antivirus<= 7.3
eset endpoint security<= 7.3
eset file security<= 7.2
eset internet security<= 13.2
eset internet securityall versions
eset mail security<= 7.2
eset nod32 antivirus<= 7.3
eset nod32 antivirus<= 13.2
◈

Sigma Hunt Rules

6
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.
producthighKaspersky Endpoint Security Stopped Via CommandLine - Linux
producthighPotential Persistence Via Security Descriptors - ScriptBlock
producthighAllow Service Access Using Security Descriptor Tampering Via Sc.EXE
producthighDeny Service Access Using Security Descriptor Tampering Via Sc.EXE
producthighPython Function Execution Security Warning Disabled In Excel
producthighSecurity Service Disabled Via Reg.EXE
▣

Scoring & Timeline

5.5
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 NVD26 Jan 2021 · 06:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://support.eset.com/en/ca7794-local-privilege-escalation-vulnerability-fixed-in-eset-products-for-windowsVendor Advisory
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