Synopsis
The remote device is missing a vendor-supplied security patch.
Description
According to its self-reported version number, the remote Juniper Junos device is affected by multiple vulnerabilities :
- A carry propagation error exists in the OpenSSL component in the Broadwell-specific Montgomery multiplication procedure when handling input lengths divisible by but longer than 256 bits. This can result in transient authentication and key negotiation failures or reproducible erroneous outcomes of public-key operations with specially crafted input. A man-in-the-middle attacker can possibly exploit this issue to compromise ECDH key negotiations that utilize Brainpool P-512 curves. (CVE-2016-7055)
- An out-of-bounds read error exists in the OpenSSL component when handling packets using the CHACHA20/POLY1305 or RC4-MD5 ciphers. An unauthenticated, remote attacker can exploit this, via specially crafted truncated packets, to cause a denial of service condition. (CVE-2017-3731)
- A carry propagating error exists in the OpenSSL component in the x86_64 Montgomery squaring implementation that may cause the BN_mod_exp() function to produce incorrect results. An unauthenticated, remote attacker with sufficient resources can exploit this to obtain sensitive information regarding private keys.
(CVE-2017-3732)
Note that these vulnerabilities only affect devices with J-Web or the SSL service for JUNOScript enabled.
Solution
Upgrade to the relevant Junos software release referenced in Juniper security advisory JSA10775. Alternatively, disable the J-Web service and use Netconf for JUNOScript rather than SSL.