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Debian Security Advisory DSA 3488-1 (libssh - 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:N/A:P

Solution Type

Solution Type

Vendor Patch

Created

Created

6 years ago

Modified

Modified

3 years ago

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Summary

Aris Adamantiadis discovered that libssh, a tiny C SSH library, incorrectly generated a short ephemeral secret for the diffie-hellman-group1 and diffie-hellman-group14 key exchange methods. The resulting secret is 128 bits long, instead of the recommended sizes of 1024 and 2048 bits respectively. This flaw could allow an eavesdropper with enough resources to decrypt or intercept SSH sessions.

Affected Software

Affected Software

libssh 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 0.5.4-1+deb7u3. This update also includes fixes for CVE-2014-8132 and CVE-2015-3146 , which were previously scheduled for the next wheezy point release. For the stable distribution (jessie), this problem has been fixed in version 0.6.3-4+deb8u2. We recommend that you upgrade your libssh packages.

Common Vulnerabilities and Exposures (CVE)

References

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