vulnerability
Arch Linux: Authentication bypass (CVE-2018-16152)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 5 | (AV:N/AC:L/Au:N/C:N/I:P/A:N) | Sep 26, 2018 | Jul 11, 2025 | Mar 25, 2026 |
Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
Published
Sep 26, 2018
Added
Jul 11, 2025
Modified
Mar 25, 2026
Description
The algorithmIdentifier structure on a PKCS#1.5 signature contains an optional parameters field. While none of the algorithms used with PKCS#1 use parameters, i.e. the field should always be encoded as ASN.1 NULL value, the strongswan decoder doesn't enforce this and simply skips over the parameters. This allows an attacker to fill the field with random data which allows to carry out a Bleichenbacher-style attack on low-exponent keys and forge signatures or create arbitrary CA certificates.
Solution
arch-linux-upgrade-latest
References
Rapid7 Labs
2026 Global Threat Landscape Report
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