65 lines
2.3 KiB
Diff
65 lines
2.3 KiB
Diff
commit cf1a0c411b2668c57c41e9c4efd15ba17b6b322c
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Author: Tom Yu <tlyu@mit.edu>
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Date: Fri May 3 16:26:46 2013 -0400
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Fix kpasswd UDP ping-pong [CVE-2002-2443]
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The kpasswd service provided by kadmind was vulnerable to a UDP
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"ping-pong" attack [CVE-2002-2443]. Don't respond to packets unless
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they pass some basic validation, and don't respond to our own error
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packets.
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Some authors use CVE-1999-0103 to refer to the kpasswd UDP ping-pong
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attack or UDP ping-pong attacks in general, but there is discussion
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leading toward narrowing the definition of CVE-1999-0103 to the echo,
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chargen, or other similar built-in inetd services.
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Thanks to Vincent Danen for alerting us to this issue.
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CVSSv2: AV:N/AC:L/Au:N/C:N/I:N/A:P/E:P/RL:O/RC:C
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ticket: 7637 (new)
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target_version: 1.11.3
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tags: pullup
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diff --git a/src/kadmin/server/schpw.c b/src/kadmin/server/schpw.c
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index 15b0ab5..7f455d8 100644
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--- a/src/kadmin/server/schpw.c
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+++ b/src/kadmin/server/schpw.c
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@@ -52,7 +52,7 @@ process_chpw_request(krb5_context context, void *server_handle, char *realm,
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ret = KRB5KRB_AP_ERR_MODIFIED;
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numresult = KRB5_KPASSWD_MALFORMED;
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strlcpy(strresult, "Request was truncated", sizeof(strresult));
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- goto chpwfail;
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+ goto bailout;
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}
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ptr = req->data;
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@@ -67,7 +67,7 @@ process_chpw_request(krb5_context context, void *server_handle, char *realm,
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numresult = KRB5_KPASSWD_MALFORMED;
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strlcpy(strresult, "Request length was inconsistent",
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sizeof(strresult));
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- goto chpwfail;
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+ goto bailout;
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}
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/* verify version number */
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@@ -80,7 +80,7 @@ process_chpw_request(krb5_context context, void *server_handle, char *realm,
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numresult = KRB5_KPASSWD_BAD_VERSION;
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snprintf(strresult, sizeof(strresult),
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"Request contained unknown protocol version number %d", vno);
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- goto chpwfail;
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+ goto bailout;
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}
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/* read, check ap-req length */
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@@ -93,7 +93,7 @@ process_chpw_request(krb5_context context, void *server_handle, char *realm,
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numresult = KRB5_KPASSWD_MALFORMED;
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strlcpy(strresult, "Request was truncated in AP-REQ",
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sizeof(strresult));
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- goto chpwfail;
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+ goto bailout;
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}
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/* verify ap_req */
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