Date: Tue, 26 Mar 2002 18:00:56 +0900 (JST) From: Isao SEKI <iseki@gongon.com> To: FreeBSD-gnats-submit@FreeBSD.org Subject: ports/36326: quick patch for qpopper4.0.3_1 buffer overflow Message-ID: <200203260900.g2Q90uEp056920@gongon1.gongon.com>
next in thread | raw e-mail | index | archive | help
>Number: 36326
>Category: ports
>Synopsis: quick patch for qpopper4.0.3_1 buffer overflow
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-ports
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Mar 26 01:10:00 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Isao SEKI
>Release: FreeBSD 4.5-RELEASE i386
>Organization:
personal
>Environment:
System: FreeBSD gongon1.gongon.com 4.5-RELEASE FreeBSD 4.5-RELEASE #1: Thu Jan 31 18:40:00 JST 2002 iseki@gongon6.gongon.com:/usr/src/sys/compile/GONGON_NOSTUN i386
>Description:
If a string of longer than approximately 2048 characters is sent to
the qpopper process, a denial of service condition will occur.
>How-To-Repeat:
Please see at the Description.
>Fix:
I have made a quick patch for qpopper4.0.3.
*** popper.c.dist Sat Jun 2 11:24:36 2001
--- popper.c Tue Mar 26 16:24:30 2002
***************
*** 483,489 ****
--- 483,501 ----
else
len = read ( pPOP->input_fd, junk, sizeof(junk) );
if ( len <= 0 )
+ #if 0
break;
+ #else
+ {
+ /*
+ * patch by Isao SEKI <iseki@gongon.com>
+ * return 0 is meaningless after buffer overflow
+ */
+ pop_log (pPOP, POP_NOTICE, HERE,
+ "read 0 byte after buffer overflow\n");
+ return(NULL);
+ }
+ #endif
q = strchr ( junk, '\n' );
if ( q == NULL ) {
disc += len;
>Release-Note:
>Audit-Trail:
>Unformatted:
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-ports" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200203260900.g2Q90uEp056920>