strongswan: authentication bypass in verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c
Published Sep 26, 2018
7.5
HIGHCVSS 3.1
EPSS 1.89%
Description
In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin in strongSwan 4.x and 5.x before 5.7.0, the RSA implementation based on GMP does not reject excess data after the encoded algorithm OID during PKCS#1 v1.5 signature verification. Similar to the flaw in the same version of strongSwan regarding digestAlgorithm.parameters, a remote attacker can forge signatures when small public exponents are being used, which could lead to impersonation when only an RSA signature is used for IKEv2 authentication.
Affected products
No data.
Configuration 1
- ≥ 4.0.0 · ≤ 4.6.4
- ≥ 5.0.0 · < 5.7.0
Configuration 2
- 8.0
- 9.0
Configuration 3
- 14.04
- 16.04
- 18.04
No data.
Red Hat Enterprise Linux 7
strongimcv
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | strongimcv | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
1 other source (Red Hat) ▾
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
AV:N/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Dec 3, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (13 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.89% (0.01888) | 78.78th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.89% (0.01888) | 76.77th | v5 (v2026.06.15) |
| Mar 17, 2025 | 1.24% (0.01244) | 77.91th | v4 (v2025.03.14) |
| Dec 12, 2024 | 1.05% (0.01053) | 84.70th | v3 (v2023.03.01) |
| Apr 21, 2024 | 1.05% (0.01053) | 83.87th | v3 (v2023.03.01) |
| Feb 17, 2024 | 1.15% (0.01152) | 84.39th | v3 (v2023.03.01) |
| Nov 8, 2023 | 1.43% (0.01434) | 85.08th | v3 (v2023.03.01) |
| Sep 20, 2023 | 0.80% (0.00800) | 79.58th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.94% (0.00943) | 80.71th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.41% (0.01408) | 72.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.41% (0.01408) | 49.94th | v2 (v2022.01.01) |
| Feb 3, 2022 | 2.33% (0.02335) | 53.78th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.33% (0.02335) | 0.00th | v1 |
References (12)
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00077.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00001.html vendor-advisoryx_refsource_SUSE
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00047.html vendor-advisoryx_refsource_SUSE
- https://access.redhat.com/security/cve/CVE-2018-16151 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1635873 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2018/09/msg00032.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2018-16151
- https://security.gentoo.org/glsa/201811-16 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://usn.ubuntu.com/3771-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2018-16151
- https://www.debian.org/security/2018/dsa-4305 vendor-advisoryx_refsource_DEBIANThird Party Advisory
- https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-%28cve-2018-16151%2C-cve-2018-16152%29.html x_refsource_CONFIRM
Change history (0)
No recorded changes yet.