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OpenSSH < 7.4 is vulnerable to CVE-2016-10012, relating to pre-authentication compression. (Bug #275727)

Product
SteelHead (Appliance)
Fixed in Version:
steelhead 9.6.0, steelhead 9.2.3
Last Modified:
2018-07-30
Summary
DETAILS:

CVE-2016-10012: The shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before 7.4 does not ensure that a bounds check is enforced by all compilers, which might allows local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures.

FIX:

Removed "Compression yes" from the sshd_config file to turn off pre-authentication compression. The default is "Compression delayed", which uses compression only after authentication.

RECOMMENDATION:

Upgrade to a software version with the fix.