vulnerability
Arch Linux: Arbitrary code execution (CVE-2017-7521)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 4 | (AV:N/AC:M/Au:N/C:N/I:N/A:P) | Jun 27, 2017 | Jul 11, 2025 | Nov 27, 2025 |
Severity
4
CVSS
(AV:N/AC:M/Au:N/C:N/I:N/A:P)
Published
Jun 27, 2017
Added
Jul 11, 2025
Modified
Nov 27, 2025
Description
A use-after-free has been found in OpenVPN < 2.4.3. The issue is caused by extract_x509_extension() not checking the return value of ASN1_STRING_to_UTF8(), and using then freeing a memory allocation that has already been freed if it failed. The issue requires the use of the --x509-alt-username option with an x509 extension, and is very unlikely to be triggered unless the remote peer can make the local process run out of memory.
Solution
arch-linux-upgrade-latest
References
- CVE-2017-7521
- https://attackerkb.com/topics/CVE-2017-7521
- URL-http://www.debian.org/security/2017/dsa-3900
- URL-http://www.securityfocus.com/bid/99230
- URL-http://www.securitytracker.com/id/1038768
- URL-https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243
- URL-https://guidovranken.wordpress.com/2017/06/21/the-openvpn-post-audit-bug-bonanza/
- URL-https://security.archlinux.org/ASA-201706-27
- CWE-400
- CWE-415
- CWE-772
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