This is interesting because the version of screenOS that is affected has the same build date as the version that shipped with the router. If we perform a diff of the two binaries, we can see that the only difference is that the 6.3.0r19b SSG5 firmware has an additional sub_13DBEC function that is used to authenticate into the privileged shell. The “auth_admin_ssh_special” string is also present in the version of screenOS that is affected, but it is not used in this instance. The only way to fix this issue would be to roll back to a previous version of screenOS or to update to a new version that is not affected. Although the backdoor is not present in older versions of ScreenOS, rolling back is a known mitigation technique for other issues. Unfortunately, there does not appear to be any way to update to a new version of ScreenOS at this time.
In order to confirm that all versions of ScreenOS were affected, we looked at available binary decoders. Both the armvc7 and armv6 versions of R2W allow for ARMv6 decoding. Since ScreenOS runs on ARMv6, this means that all versions of ScreenOS are vulnerable to this technique. We downloaded and decoded every version of the ScreenOS binary available on these sites and cross checked them against the ZMap scans. Each binary is signed, but no version of ScreenOS appeared in a ZMap scan that was not also present on the decoder sites. This means that all versions of ScreenOS are vulnerable to this technique and that Juniper has a final release for this vulnerability (at least for versions prior to 6.3.0r17).
To confirm that the backdoor is present in 6.3.0r19b, we uploaded the SSG5 firmware to DecryptorX and verified that it had the backdoor. We also validated that the backdoor is fixed in 6.3.0r20.
This is another example of a Juniper backdoor that is present in ScreenOS and is (also) difficult to spot. If you would like more information on Juniper's ScreenOS and how to identify potential issues, please check out our SSG5 Journey .
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