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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. This vulnerability was discovered independently 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@localhost

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 and Metasploit module is published
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