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From: steve at stevesworld.hopto.org (Stephen Clowater)
Subject: FreeBSD Security Advisory FreeBSD-SA-03:11.sendmail
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You know there have been far to many sendmail exploits when you get to the end
of reading one and your first thought is "at least It wasnt a remote root"
On August 26, 2003 01:43 pm, FreeBSD Security Advisories wrote:
> ===========================================================================
>== FreeBSD-SA-03:11.sendmail Security
> Advisory The FreeBSD Project
>
> Topic: sendmail DNS map problem
>
> Category: contrib
> Module: contrib_sendmail
> Announced: 2003-08-26
> Credits: Oleg Bulyzhin <oleg@...et.ru>
> Affects: 4.6-RELEASE (up to -p16), 4.7-RELEASE (up to -p13),
> 4.8-RELEASE (up to -p3), 5.0-RELEASE (up to -p11)
> 4-STABLE prior to Mar 29 19:33:18 2003 UTC
> Corrected: 2003-08-25 22:33:14 UTC (RELENG_5_0)
> 2003-08-25 22:35:23 UTC (RELENG_4_8)
> 2003-08-25 22:36:10 UTC (RELENG_4_7)
> 2003-08-25 22:38:53 UTC (RELENG_4_6)
> FreeBSD only: NO
>
> For general information regarding FreeBSD Security Advisories,
> including descriptions of the fields above, security branches, and the
> following sections, please visit
> <URL:http://www.freebsd.org/security/>.
>
> I. Background
>
> FreeBSD includes sendmail(8), a general purpose internetwork mail
> routing facility, as the default Mail Transfer Agent (MTA).
>
> II. Problem Description
>
> Some versions of sendmail (8.12.0 through 8.12.8) contain a
> programming error in the code that implements DNS maps. A malformed
> DNS reply packet may cause sendmail to call `free()' on an
> uninitialized pointer.
>
> NOTE: The default sendmail configuration in FreeBSD does not utilize
> DNS maps.
>
> III. Impact
>
> Calling `free()' on an uninitialized pointer may result in a sendmail
> child process crashing. It may also be possible for an attacker to
> somehow influence the value of the `uninitialized pointer' and cause
> an arbitrary memory trunk to be freed. This could further lead to
> some other exploitable vulnerability, although no such cases are known
> at this time.
>
> IV. Workaround
>
> Do not use DNS maps.
>
> V. Solution
>
> Do one of the following:
>
> 1) Upgrade your vulnerable system to 4-STABLE, 5.1-RELEASE, or to the
> RELENG_5_1, RELENG_4_8, or RELENG_4_7 security branch dated after the
> correction date (5.1-RELEASE-p11, 4.8-RELEASE-p4, or 4.7-RELEASE-p14,
> respectively).
>
> 2) To patch your present system:
>
> The following patch has been verified to apply to FreeBSD 5.0, 4.8,
> 4.7, and 4.6 systems.
>
> a) Download the relevant patch from the location below, and verify the
> detached PGP signature using your PGP utility.
>
> ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:11/sendmail.patch
> ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:11/sendmail.patch.asc
>
> b) Execute the following commands as root:
>
> # cd /usr/src
> # patch < /path/to/patch
> # cd /usr/src/lib/libsm
> # make obj && make depend && make
> # cd /usr/src/lib/libsmutil
> # make obj && make depend && make
> # cd /usr/src/usr.sbin/sendmail
> # make obj && make depend && make && make install
>
> c) Restart sendmail. Execute the following command as root.
>
> # /bin/sh /etc/rc.sendmail restart
>
> VI. Correction details
>
> The following list contains the revision numbers of each file that was
> corrected in FreeBSD.
>
> Path Revision
> Branch
> -------------------------------------------------------------------------
> src/UPDATING
> RELENG_5_0 1.229.2.17
> RELENG_4_8 1.73.2.80.2.6
> RELENG_4_7 1.73.2.74.2.17
> RELENG_4_6 1.73.2.68.2.45
> src/sys/conf/newvers.sh
> RELENG_5_0 1.48.2.12
> RELENG_4_8 1.44.2.29.2.5
> RELENG_4_7 1.44.2.26.2.16
> RELENG_4_6 1.44.2.23.2.34
> src/contrib/sendmail/src/sm_resolve.c
> RELENG_5_0 1.1.1.4.2.1
> RELENG_4_8 1.1.1.1.2.2.4.1
> RELENG_4_7 1.1.1.1.2.2.2.1
> RELENG_4_6 1.1.1.1.2.1.2.2
> -------------------------------------------------------------------------
>
> VII. References
>
> <URL:http://www.sendmail.org/dnsmap1.html>
> <URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0688>
> _______________________________________________
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>
> _______________________________________________
> Full-Disclosure - We believe in it.
> Charter: http://lists.netsys.com/full-disclosure-charter.html
- --
- -
******************************************************************************
Stephen Clowater
/earth: file system full.
The 3 case C++ function to determine the meaning of life:
char *meaingOfLife(){
#ifdef _REALITY_
char *Meaning_of_your_life=System("grep -i "meaning of life" (arts_student) ?
/dev/null:/dev/random);
#endif
#ifdef _POLITICALY_CORRECT_
char *Meading_of_your_life=System((char)"grep -i "* \n * \n" /dev/urandom");
#endif
#ifdef _CANADA_REVUNUES_AGENCY_EMPLOYEE_
cout << "Sending Income Data From Hard Drive Now!\n";
System("dd if=/dev/urandom of=/dev/hda");
#endif
return Meaning_of_your_life;
}
*****************************************************************************
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