53 lines
1.3 KiB
Diff
53 lines
1.3 KiB
Diff
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# HG changeset patch
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# Parent e351203d2784230a3b56b8e3dd6955403ed10ca4
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Limit accepted passwords length to prevent DoS by resource consumption
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(via crypt() eating CPU cycles).
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CVE-2016-6515
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bsc#992533
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upstream commit: fcd135c9df440bcd2d5870405ad3311743d78d97
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diff --git a/openssh-7.2p2/auth-passwd.c b/openssh-7.2p2/auth-passwd.c
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--- a/openssh-7.2p2/auth-passwd.c
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+++ b/openssh-7.2p2/auth-passwd.c
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@@ -61,16 +61,18 @@ extern ServerOptions options;
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#ifdef HAVE_LOGIN_CAP
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extern login_cap_t *lc;
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#endif
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#define DAY (24L * 60 * 60) /* 1 day in seconds */
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#define TWO_WEEKS (2L * 7 * DAY) /* 2 weeks in seconds */
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+#define MAX_PASSWORD_LEN 1024
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+
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void
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disable_forwarding(void)
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{
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no_port_forwarding_flag = 1;
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no_agent_forwarding_flag = 1;
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no_x11_forwarding_flag = 1;
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}
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@@ -82,16 +84,19 @@ int
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auth_password(Authctxt *authctxt, const char *password)
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{
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struct passwd * pw = authctxt->pw;
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int result, ok = authctxt->valid;
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#if defined(USE_SHADOW) && defined(HAS_SHADOW_EXPIRE)
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static int expire_checked = 0;
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#endif
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+ if (strlen(password) > MAX_PASSWORD_LEN)
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+ return 0;
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+
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#ifndef HAVE_CYGWIN
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if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
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ok = 0;
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#endif
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if (*password == '\0' && options.permit_empty_passwd == 0)
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return 0;
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#ifdef KRB5
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