Headline
CVE-2016-6515: upstream commit · openssh/openssh-portable@fcd135c
The auth_password function in auth-passwd.c in sshd in OpenSSH before 7.3 does not limit password lengths for password authentication, which allows remote attackers to cause a denial of service (crypt CPU consumption) via a long string.
@@ -1,4 +1,4 @@ /* $OpenBSD: auth-passwd.c,v 1.44 2014/07/15 15:54:14 millert Exp $ */ /* $OpenBSD: auth-passwd.c,v 1.45 2016/07/21 01:39:35 dtucker Exp $ */ /* * Author: Tatu Ylonen [email protected] * Copyright © 1995 Tatu Ylonen [email protected], Espoo, Finland @@ -66,6 +66,8 @@ extern login_cap_t *lc; #define DAY (24L * 60 * 60) /* 1 day in seconds */ #define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
#define MAX_PASSWORD_LEN 1024
void disable_forwarding(void) { @@ -87,6 +89,9 @@ auth_password(Authctxt *authctxt, const char *password) static int expire_checked = 0; #endif
if (strlen(password) > MAX_PASSWORD_LEN) return 0;
#ifndef HAVE_CYGWIN if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES) ok = 0;
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