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Category:   Application (VPN)  >   strongSwan Vendors:
strongSwan OpenSSL Plugin ECDSA Signature Verification Flaw Lets Remote Users Bypass Authentication
SecurityTracker Alert ID:  1028508
SecurityTracker URL:
CVE Reference:   CVE-2013-2944   (Links to External Site)
Date:  May 2 2013
Impact:   User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.5 - 5.0.3
Description:   A vulnerability was reported in strongSwan. A remote user can bypass authentication.

On systems where the openssl plugin is used for ECDSA signature verification, a remote user can send a specially crafted signature to authenticate as a target user.

A remote user can use an empty, zeroed, or otherwise invalid signature to exploit this flaw.

Both IKEv1 and IKEv2 are affected.

Systems that have enabled and loaded the OpenSSL crypto backend (--enable-openssl) are affected. The default crypto backends are not affected.

Kevin Wojtysiak reported this vulnerability.

Impact:   A remote user can bypass authentication to gain access acting as the target user.
Solution:   The vendor has issued a fix (5.0.4).

The vendor's advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.

 Source Message Contents

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