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TI-2018-11286 Aliases CVE-2018-15836GHSA-3qpc-4533-p5rr

In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the…

Priority LOW 36CWE-347Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-347.

Summary

In verify_signed_hash() in lib/liboswkeys/signatures.c in Openswan before 2.6.50.1, the RSA implementation does not verify the value of padding string during PKCS#1 v1.5 signature verification. Consequently, a remote attacker can forge signatures when small public exponents are being used. IKEv2 signature verification is affected when RAW RSA keys are used.

Why it matters now

EPSS 0.01522 74th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:xelerance:openswan:*:*:*:*:*:*:*:*before 2.6.50.1VulnerableXelerance
  • cpe:2.3:a:xelerance:openswan:*:*:*:*:*:*:*:* Versions before 2.6.50.1 Vulnerable ·Xelerance

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 2 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-15836
  2. 2026-10-03 Alias added: GHSA-3qpc-4533-p5rr

References

Patch 2

Advisory 1

  • TI-2005-03466 The Internet Key Exchange version 1 (IKEv1) implementation in Openswan 2 (openswan-2)… CVSS 2.0HIGH 7.8
  • TI-2010-03162 Buffer overflow in programs/pluto/xauth.c in the client in Openswan 2.6.26 through 2.6.28… CVSS 2.0MEDIUM 6.5
  • TI-2013-01824 Buffer overflow in the atodn function in Openswan before 2.6.39, when Opportunistic… CVSS 2.0MEDIUM 6.8
  • TI-2010-03156 Buffer overflow in programs/pluto/xauth.c in the client in Openswan 2.6.25 through 2.6.28… CVSS 2.0MEDIUM 6.5
  • TI-2005-00141 Stack-based buffer overflow in the get_internal_addresses function in the pluto… CVSS 2.0HIGH 7.2
  • TI-2010-03564 programs/pluto/xauth.c in the client in Openswan 2.6.25 through 2.6.28 allows remote… CVSS 2.0MEDIUM 6.5
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences