Vulnerability Details : CVE-2019-11396
An issue was discovered in Avira Free Security Suite 10. The permissive access rights on the SoftwareUpdater folder (files / folders and configuration) are incompatible with the privileged file manipulation performed by the product. Files can be created that can be used by an unprivileged user to obtain SYSTEM privileges. Arbitrary file creation can be achieved by abusing the SwuConfig.json file creation: an unprivileged user can replace these files by pseudo-symbolic links to arbitrary files. When an update occurs, a privileged service creates a file and sets its access rights, offering write access to the Everyone group in any directory.
Products affected by CVE-2019-11396
- cpe:2.3:a:avira:free_security_suite:2019:*:*:*:*:*:*:*
- cpe:2.3:a:avira:software_updater:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-11396
0.06%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 28 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-11396
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST | |
|
7.8
|
HIGH | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2019-11396
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-11396
-
https://seclists.org/fulldisclosure/2019/Aug/1
Full Disclosure: Avira Free Security Suite 2019 - Exploiting Arbitrary File Writes for Local Elevation of PrivilegeMailing List;Third Party Advisory
-
http://packetstormsecurity.com/files/153868/Avira-Free-Security-Suite-2019-Software-Updater-2.0.6.13175-Improper-Access-Control.html
Avira Free Security Suite 2019 Software Updater 2.0.6.13175 Improper Access Control ≈ Packet Storm
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https://medium.com/sidechannel-br/vulnerabilidade-no-avira-security-suite-pode-levar-%C3%A0-escala%C3%A7%C3%A3o-de-privil%C3%A9gios-no-windows-71964236c077
Vulnerabilidade no Avira Security Suite pode levar à escalação de privilégios no Windows
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