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Debian Security Advisory DSA 3398-1 (strongswan - security update)

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

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

Solution Type

Solution Type

Vendor Patch

Created

Created

6 years ago

Modified

Modified

3 years ago

Share

Summary

Tobias Brunner found an authentication bypass vulnerability in strongSwan, an IKE/IPsec suite. Due to insufficient validation of its local state the server implementation of the EAP-MSCHAPv2 protocol in the eap-mschapv2 plugin can be tricked into successfully concluding the authentication without providing valid credentials. It's possible to recognize such attacks by looking at the server logs. The following log message would be seen during the client authentication: EAP method EAP_MSCHAPV2 succeeded, no MSK established

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 oldstable distribution (wheezy), this problem has been fixed in version 4.5.2-1.5+deb7u8. For the stable distribution (jessie), this problem has been fixed in version 5.2.1-6+deb8u2. For the testing distribution (stretch), this problem has been fixed in version 5.3.3-3. For the unstable distribution (sid), this problem has been fixed in version 5.3.3-3. We recommend that you upgrade your strongswan packages.

Common Vulnerabilities and Exposures (CVE)

References

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