FreeBSD : go -- information disclosure vulnerability (6809c6db-bdeb-11e5-b5fe-002590263bf5)

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

Jason Buberel reports :

A security-related issue has been reported in Go's math/big package.
The issue was introduced in Go 1.5. We recommend that all users
upgrade to Go 1.5.3, which fixes the issue. Go programs must be
recompiled with Go 1.5.3 in order to receive the fix.

The Go team would like to thank Nick Craig-Wood for identifying the
issue.

This issue can affect RSA computations in crypto/rsa, which is used by
crypto/tls. TLS servers on 32-bit systems could plausibly leak their
RSA private key due to this issue. Other protocol implementations that
create many RSA signatures could also be impacted in the same way.

Specifically, incorrect results in one part of the RSA Chinese
Remainder computation can cause the result to be incorrect in such a
way that it leaks one of the primes. While RSA blinding should prevent
an attacker from crafting specific inputs that trigger the bug, on
32-bit systems the bug can be expected to occur at random around one
in 2^26 times. Thus collecting around 64 million signatures (of known
data) from an affected server should be enough to extract the private
key used.

On 64-bit systems, the frequency of the bug is so low (less than one
in 2^50) that it would be very difficult to exploit. Nonetheless,
everyone is strongly encouraged to upgrade.

See also :

http://www.openwall.com/lists/oss-security/2016/01/13/7
https://go-review.googlesource.com/#/c/17672/
https://go-review.googlesource.com/#/c/18491/
http://www.nessus.org/u?8e7563d3

Solution :

Update the affected package.

Risk factor :

Medium / CVSS Base Score : 5.0
(CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N)

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 87983 ()

Bugtraq ID:

CVE ID: CVE-2015-8618

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