CVE-2020-9475Public exploit

Root privilege escalation via logrotate symlink race

Published May 7, 2020 · Updated Aug 4, 2024

Local privilege escalation in S. Siedle & Soehne SG 150-0 Smart Gateway before 1.2.4 allows local users to gain root access. The MySQL logrotate script moves and recreates mysql.log without preventing a symlink swap, so a mysql user can redirect root-owned touch and chown operations to create a writable file under /etc/logrotate.d. Exploitation requires existing shell access, stopping MySQL, and winning two races; a planted logrotate entry then makes an attacker-supplied binary set-user-ID root.

CVSS severity7.0
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Local privilege escalation in S. Siedle & Soehne SG 150-0 Smart Gateway before 1.2.4 allows local users to gain root access. The MySQL logrotate script moves and recreates mysql.log without preventing a symlink swap, so a mysql user can redirect root-owned touch and chown operations to create a writable file under /etc/logrotate.d. Exploitation requires existing shell access, stopping MySQL, and winning two races; a planted logrotate entry then makes an attacker-supplied binary set-user-ID root.

The record

CVE
CVE-2020-9475
Published
May 7, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-362, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 7, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.9NIST NVDAV:L/AC:M/Au:N/C:C/I:C/A:C
7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
T1068Exploitation for Privilege Escalation

Public exploit references

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Technologies

Your stack

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Your stack

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