F-Secure SAFE Installer OLEACC.dll access control

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CVSS Meta Temp Score
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CTI Interest Score
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6.3$0-$5k0.00

A vulnerability, which was classified as critical, has been found in F-Secure SAFE, Internet Security, Anti-Virus, Client Security, PSB Workstation Security and Computer Protection (Anti-Malware Software). This issue affects an unknown code of the file C:\Windows\Temp\OLEACC.dll of the component Installer. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-264. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the F-Secure installer in F-Secure SAFE for Windows before 17.6, F-Secure Internet Security before 17.6, F-Secure Anti-Virus before 17.6, F-Secure Client Security Standard and Premium before 14.10, F-Secure PSB Workstation Security before 12.01, and F-Secure Computer Protection Standard and Premium before 19.3, a local user can escalate their privileges through a DLL hijacking attack against the installer. The installer writes the file rm.exe to C:\Windows\Temp and then executes it. The rm.exe process then attempts to load several DLLs from its current directory. Non-admin users are able to write to this folder, so an attacker can create a malicious C:\Windows\Temp\OLEACC.dll file. When an admin runs the installer, rm.exe will execute the attacker's DLL in an elevated security context.

The bug was discovered 05/16/2019. The weakness was shared 05/17/2019 (Website). The advisory is shared at f-secure.com. The identification of this vulnerability is CVE-2019-11644 since 05/01/2019. An attack has to be approached locally. A simple authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

Upgrading eliminates this vulnerability.

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CVSSv3infoedit

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2infoedit

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

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Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-264
ATT&CK: T1068

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfoedit

Threat: 🔍
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Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfoedit

05/01/2019 🔍
05/16/2019 +15 days 🔍
05/17/2019 +1 days 🔍
05/18/2019 +1 days 🔍
06/21/2020 +400 days 🔍

Sourcesinfoedit

Vendor: https://www.f-secure.com/

Advisory: f-secure.com
Status: Not defined
Confirmation: 🔍

CVE: CVE-2019-11644 (🔍)

Entryinfoedit

Created: 05/18/2019 09:26 AM
Updated: 06/21/2020 08:56 AM
Changes: (2) vulnerability_discoverydate advisory_confirm_url
Complete: 🔍

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