The hash_buffer function in schnorr.c in OpenSSH through 6.4, when Makefile.inc is modified to enable the J-PAKE protocol, does not initialize certain data structures, which might allow remote attackers to cause a denial of service (memory corruption) or have unspecified other impact via vectors that trigger an error condition.
CVSS Severity (version 2.0):
Impact Subscore: 6.4
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
**NOTE: Access Complexity scored Low due to insufficient information
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
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[oss-security] 20140129 Re: OpenSSH J-PAKE vulnerability (no cause for panic! remain calm!)
[oss-security] 20140128 OpenSSH J-PAKE vulnerability (no cause for panic! remain calm!)