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| author | Tom Yu <tlyu@mit.edu> | 2013-05-03 16:26:46 -0400 |
|---|---|---|
| committer | Tom Yu <tlyu@mit.edu> | 2013-05-13 12:46:34 -0400 |
| commit | cf1a0c411b2668c57c41e9c4efd15ba17b6b322c (patch) | |
| tree | 847fb5242e6c9e0a6f16c10f45de70b2bd300b1c | |
| parent | 0a97afba6986e2818cd26869704820e00efcae63 (diff) | |
| download | krb5-cf1a0c411b2668c57c41e9c4efd15ba17b6b322c.tar.gz krb5-cf1a0c411b2668c57c41e9c4efd15ba17b6b322c.tar.xz krb5-cf1a0c411b2668c57c41e9c4efd15ba17b6b322c.zip | |
Fix kpasswd UDP ping-pong [CVE-2002-2443]
The kpasswd service provided by kadmind was vulnerable to a UDP
"ping-pong" attack [CVE-2002-2443]. Don't respond to packets unless
they pass some basic validation, and don't respond to our own error
packets.
Some authors use CVE-1999-0103 to refer to the kpasswd UDP ping-pong
attack or UDP ping-pong attacks in general, but there is discussion
leading toward narrowing the definition of CVE-1999-0103 to the echo,
chargen, or other similar built-in inetd services.
Thanks to Vincent Danen for alerting us to this issue.
CVSSv2: AV:N/AC:L/Au:N/C:N/I:N/A:P/E:P/RL:O/RC:C
ticket: 7637 (new)
target_version: 1.11.3
tags: pullup
| -rw-r--r-- | src/kadmin/server/schpw.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/kadmin/server/schpw.c b/src/kadmin/server/schpw.c index 15b0ab5a3..7f455d864 100644 --- a/src/kadmin/server/schpw.c +++ b/src/kadmin/server/schpw.c @@ -52,7 +52,7 @@ process_chpw_request(krb5_context context, void *server_handle, char *realm, ret = KRB5KRB_AP_ERR_MODIFIED; numresult = KRB5_KPASSWD_MALFORMED; strlcpy(strresult, "Request was truncated", sizeof(strresult)); - goto chpwfail; + goto bailout; } ptr = req->data; @@ -67,7 +67,7 @@ process_chpw_request(krb5_context context, void *server_handle, char *realm, numresult = KRB5_KPASSWD_MALFORMED; strlcpy(strresult, "Request length was inconsistent", sizeof(strresult)); - goto chpwfail; + goto bailout; } /* verify version number */ @@ -80,7 +80,7 @@ process_chpw_request(krb5_context context, void *server_handle, char *realm, numresult = KRB5_KPASSWD_BAD_VERSION; snprintf(strresult, sizeof(strresult), "Request contained unknown protocol version number %d", vno); - goto chpwfail; + goto bailout; } /* read, check ap-req length */ @@ -93,7 +93,7 @@ process_chpw_request(krb5_context context, void *server_handle, char *realm, numresult = KRB5_KPASSWD_MALFORMED; strlcpy(strresult, "Request was truncated in AP-REQ", sizeof(strresult)); - goto chpwfail; + goto bailout; } /* verify ap_req */ |