Exponent Openswan up to 2.6.50.0 IKEv2 Signature RSA Signature Bleichenbacher signature verification

Summaryinfo

A vulnerability was found in Exponent Openswan up to 2.6.50.0. It has been rated as critical. Impacted is an unknown function of the component IKEv2 Signature Handler. The manipulation as part of RSA Signature leads to signature verification (Bleichenbacher). This vulnerability is documented as CVE-2018-15836. The attack can be initiated remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

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.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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
• 2.6.50.0

License

• open-source

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

• 🔍
• 🔍
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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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