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Debian Security Advisory DSA 2665-1 (strongswan - authentication bypass)

Information

Severity

Severity

High

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

7.5

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

9 years ago

Modified

Modified

8 months ago

Summary

Kevin Wojtysiak discovered a vulnerability in strongSwan, an IPsec based VPN solution. When using the OpenSSL plugin for ECDSA based authentication, an empty, zeroed or otherwise invalid signature is handled as a legitimate one. An attacker could use a forged signature to authenticate like a legitimate user and gain access to the VPN (and everything protected by this). While the issue looks like CVE-2012-2388 (RSA signature based authentication bypass), it is unrelated.

Affected Software

Affected Software

strongswan on Debian Linux

Detection Method

Detection Method

This check tests the installed software version using the apt package manager.

Solution

Solution

For the stable distribution (squeeze), this problem has been fixed in version 4.4.1-5.3. For the testing distribution (wheezy), this problem has been fixed in version 4.5.2-1.5+deb7u1. For the unstable distribution (sid), this problem has been fixed in version 4.6.4-7. We recommend that you upgrade your strongswan packages.

Common Vulnerabilities and Exposures (CVE)