Memory Initialization Vulnerability in OpenSSH 6.2 and 6.3

CVE-2013-4548 · MEDIUM Severity

AV:N/AC:M/AU:S/C:P/I:P/A:P

The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.

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