A vulnerability, which was classified as critical, has been found in Exponent Openswan up to 2.6.50.0. This issue affects an unknown function of the component IKEv2 Signature Handler. The manipulation as part of a RSA Signature leads to a signature verification vulnerability (Bleichenbacher). Using CWE to declare the problem leads to CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In Openswan before 2.6.50.1, IKEv2 signature verification is vulnerable to "Variants of Bleichenbacher's Low-Exponent Attack on PKCS#1 RSA Signatures" attacks when RAW RSA keys are used.

The bug was discovered 08/25/2018. The weakness was released 09/26/2018 (Website). The advisory is shared at lists.openswan.org. The identification of this vulnerability is CVE-2018-15836 since 08/23/2018. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 32 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version bis 2.6.50.0 eliminates this vulnerability.

Productinfo

Vendor

• Exponent

Name

• Openswan

Version

• 2.6.0
• 2.6.1
• 2.6.2
• 2.6.3
• 2.6.4
• 2.6.5
• 2.6.6
• 2.6.7
• 2.6.8
• 2.6.9
• 2.6.10
• 2.6.11
• 2.6.12
• 2.6.13
• 2.6.14
• 2.6.15
• 2.6.16
• 2.6.17
• 2.6.18
• 2.6.19
• 2.6.20
• 2.6.21
• 2.6.22
• 2.6.23
• 2.6.24
• 2.6.25
• 2.6.26
• 2.6.27
• 2.6.28
• 2.6.29
• 2.6.30
• 2.6.31
• 2.6.32
• 2.6.33
• 2.6.34
• 2.6.35
• 2.6.36
• 2.6.37
• 2.6.38
• 2.6.39
• 2.6.40
• 2.6.41
• 2.6.42
• 2.6.43
• 2.6.44
• 2.6.45
• 2.6.46
• 2.6.47
• 2.6.48
• 2.6.49
• 2.6.50

License

• open-source

CPE 2.3info

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CPE 2.2info

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