Bug 1635873 – CVE-2018-16151 strongswan: authentication bypass in verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c

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Bug 1635873 - (CVE-2018-16151) CVE-2018-16151 strongswan: authentication bypass in verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c

Summary:	CVE-2018-16151 strongswan: authentication bypass in verify_emsa_pkcs1_signatu...

Status:	NEW

Aliases:	CVE-2018-16151

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
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Assigned To:	Red Hat Product Security
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Whiteboard:	impact=moderate,public=20180924,repor...
Keywords:	Security

Depends On:	1635874 1635875
Blocks:	1635880
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Reported:	2018-10-03 15:55 EDT by Laura Pardo
Modified:	2018-10-03 16:10 EDT (History)
CC List:	4 users (show)

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Description Laura Pardo 2018-10-03 15:55:14 EDT

A flaw was found in strongSwan 4.x and 5.x before 5.7.0. In verify_emsa_pkcs1_signature() in gmp_rsa_public_key.c in the gmp plugin, 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. 


References:
https://www.strongswan.org/blog/2018/09/24/strongswan-vulnerability-(cve-2018-16151,-cve-2018-16152).html

Comment 1 Laura Pardo 2018-10-03 15:56:09 EDT

Created strongswan tracking bugs for this issue:

Affects: epel-all [bug 1635874]
Affects: fedora-all [bug 1635875]

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