full-disclosure - [FD] Ceragon FibeAir IP-10 SSH Private Key Exposure (CVE-2015-0936)

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Message-ID: <CAGrRQy6nv_aBARX9tpz0EhWhdcUqpmtYESQQxnCrt9fvfgK5dw@mail.gmail.com>
Date: Wed, 1 Apr 2015 14:09:25 -0500
From: Tod Beardsley <todb@...asploit.com>
To: fulldisclosure@...lists.org
Subject: [FD] Ceragon FibeAir IP-10 SSH Private Key Exposure (CVE-2015-0936)

# Ceragon FibeAir IP-10 SSH Private Key Exposure (CVE-2015-0936)

## Product Description

Ceragon produces a series of ruggedized, microwave backhaul devices used
to provide connectivity to mobile, IP-based devices; usually, these
devices are found in either large industrial environments, or installed
on towers to provide "middle-mile" connectivity to mobile customers on
behalf of ISPs. In other words, a FibeAir IP-10 typically act as a router
of IP traffic. A compromise on these devices can expose the
communications of all subscribed devices.

## Vulnerability Summary

Several versions of Ceragon FibeAir IP-10 devices have been identified
as having a static, pre-generated public/private keypair associated with
the "mateidu" user available both locally on these devices, and as part
of update packages. This issue is similar to the previously-reported
default root password, reported by Jasper Greve and identified as
[CVE-2015-0924][1]. This vulnerability was [discovered independently][2]
by HD Moore of Rapid7, Inc., while validating CVE-2015-0924.

## Details

There are two important distinctions from CVE-2015-0924. First, the
mateidu user does not, by default, have root-level access permissions on
the device. In order to obtain root access, an attacker would need to
also exercise a local vulnerability.

Second, even if the user was able to easily replace the mateidu
authorized_keys file, later firmware upgrades replace any existing
authorized_keys file with the standard issue key. Distributions of these
update packages containing the corresponding private key are easily
obtained by using simple search terms on any major search engine.

A Metasploit module has been produced and published to demonstrate the
vulnerability, and is made publicly available so device owners and
maintainers may effectively and easily test any mitigation and patching
solution provided or invented.

### Exposed Key Pair

The shipping public key for the mateidu user has the fingerprint,
`27:c6:ad:f9:a6:4d:22:3f:18:b0:3b:df:81:1c:57:45` , and is:

```
ssh-rsa
AAAAB3NzaC1yc2EAAAABIwAAAIEAwRIdDlHaIqZXND/l1vFT7ue3rc/DvXh2yx5EFtuxGQRHVxGMazDhV4vj5ANGXDQwUYI0iZh6aOVrDy8I/y9/y+YDGCvsnqrDbuPDjW26s2bBXWgUPiC93T3TA6L2KOxhVcl7mljEOIYACRHPpJNYVGhinCxDUH9LxMrdNXgP5Ok=
mateidu@...alhost

```

The private key is:

```
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
```

## Vendor Response

According to the vendor, "A software version that fixes the
vulnerability found in the IP-10 product has been released and is
available to our customers for download through our customer support
resource center. Customers who need assistance are encouraged to contact
a Ceragon customer support representative."

## Timeline

 * Jan 16, 2015 (Sat): CVE-2015-0924 disclosed by CERT/CC
 * Jan 21, 2015 (Thu): Rapid7 researcher HD Moore discovers this related
   vulnerability
 * Jan 26, 2015 (Mon): Vendor is notified of the vulnerability
 * Feb 02, 2015 (Tue): Vendor confirms report and indicates a fix is
   prepared
 * Feb 11, 2015 (Thu): CERT/CC is notified, assigns VU#573412 and
   CVE-2015-0936.
 * Mar 26, 2015 (Thu): Vendor confirms a fix has been released
 * Apr 01, 2015 (Wed): [Public disclosure][3] and [Metasploit module][4] is
   published

[1]:https://www.kb.cert.org/vuls/id/936356
[2]:https://hdm.io/blog/2015/01/20/partial-disclosure-is-annoying/
[3]:https://gist.github.com/todb-r7/5d86ecc8118f9eeecc15
[4]:https://github.com/rapid7/metasploit-framework/pull/5054

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