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Home » Hacking News » MDKSA-2002:040-1-openssh

MDKSA-2002:040-1-openssh

by Nikola Strahija on July 3rd, 2002 An input validation error exists in the OpenSSH server between versions 2.3.1 and 3.3 that can result in an integer overflow and privilege escalation. This error is found in the PAMAuthenticationViaKbdInt code in versions 2.3.1 to 3.3, and the ChallengeResponseAuthentication code in versions 2.9.9 to 3.3. OpenSSH 3.4 and later are not affected, and OpenSSH 3.2 and later prevent privilege escalation if UsePrivilegeSeparation is enabled; in OpenSSH 3.3 and higher this is the default behaviour of OpenSSH.


To protect yourself, users should be using OpenSSH 3.3 with
UsePrivilegeSeparation enabled (see MDKSA:2002-040). However, it is
highly recommended that all Mandrake Linux users upgrade to version
3.4 which corrects these errors.

There are a few caveats with this upgrade, however, that users should
be aware of:

- On Linux kernel 2.2 (the default for Mandrake Linux 7.x), the use
of Compression and UsePrivilegeSeparation are mutually exclusive.
You can use one feature or the other, not both; we recommend
disabling Compression and using privsep until this can be resolved.

- Using privsep may cause some PAM modules which expect to run with
root privilege to fail. For instance, users will not be able to
change their password if they attempt to log into an account with
an expired password.

If you absolutely must use one of these features that conflict with
privsep, you can disable it in /etc/ssh/sshd_config by using:

UsePrivilegeSeparation no

However, if you do this, be sure you are running OpenSSH 3.4. Updates
to OpenSSH will be made available once these problems are resolved.
________________________________________________________________________

References:

http://marc.theaimsgroup.com/?l=openssh-unix-dev&m=102495293705094&w=2
http://online.securityfocus.com/archive/1/280070/2002-06-29/2002-07-05/0
________________________________________________________________________

Updated Packages:

Linux-Mandrake 7.1:
75796ca71eb402f9857a9bf3831e740e 7.1/RPMS/openssh-3.4p1-1.2mdk.i586.rpm
817f59a4caa30308a4d98e7dba3bcc54
7.1/RPMS/openssh-askpass-3.4p1-1.2mdk.i586.rpm
fbf725ecad88b921084404187849648a
7.1/RPMS/openssh-askpass-gnome-3.4p1-1.2mdk.i586.rpm
d842f525ade248caea8ea418d232abc6
7.1/RPMS/openssh-clients-3.4p1-1.2mdk.i586.rpm
b07c97c93bf04d48099024c7a70bae66
7.1/RPMS/openssh-server-3.4p1-1.2mdk.i586.rpm
2b059962de52e888584c0260e983cf19 7.1/SRPMS/openssh-3.4p1-1.2mdk.src.rpm

Linux-Mandrake 7.2:
a641fdf0dc7d21ad0aa5a4a9bc61729a 7.2/RPMS/openssh-3.4p1-1.2mdk.i586.rpm
0dad80e92b95d7b40d7758922c4bf858
7.2/RPMS/openssh-askpass-3.4p1-1.2mdk.i586.rpm
fe7bbbef4078e47260a47c7cafb3d289
7.2/RPMS/openssh-askpass-gnome-3.4p1-1.2mdk.i586.rpm
d88bb474b91125fbd65eb680b19298f0
7.2/RPMS/openssh-clients-3.4p1-1.2mdk.i586.rpm
45891af293f145f5a7029d77803b0e03
7.2/RPMS/openssh-server-3.4p1-1.2mdk.i586.rpm
2b059962de52e888584c0260e983cf19 7.2/SRPMS/openssh-3.4p1-1.2mdk.src.rpm

Mandrake Linux 8.0:
0a719efcb863dca8871fba9caff3c262 8.0/RPMS/openssh-3.4p1-1.1mdk.i586.rpm
c6f9e360811df656b8bac26544e24f5a
8.0/RPMS/openssh-askpass-3.4p1-1.1mdk.i586.rpm
e83b5a1257b68d374965a3575f443374
8.0/RPMS/openssh-askpass-gnome-3.4p1-1.1mdk.i586.rpm
eb55d0d7e67abf5fc76c3ec734583be3
8.0/RPMS/openssh-clients-3.4p1-1.1mdk.i586.rpm
f89eaa623bc04bbbcaff435b729bb1fc
8.0/RPMS/openssh-server-3.4p1-1.1mdk.i586.rpm
ae7d14d39519c7a8cf24fb972dabf64b 8.0/SRPMS/openssh-3.4p1-1.1mdk.src.rpm

Mandrake Linux 8.0/ppc:
fc49b66b4239b6973f6a87674bd5f0a1 ppc/8.0/RPMS/openssh-3.4p1-1.1mdk.ppc.rpm
4bbb740091f635cd30a4d65415cbb4fd
ppc/8.0/RPMS/openssh-askpass-3.4p1-1.1mdk.ppc.rpm
2324f573ef5af591f6114111308ec302
ppc/8.0/RPMS/openssh-askpass-gnome-3.4p1-1.1mdk.ppc.rpm
b0921af4b6468fa092364d107ae74438
ppc/8.0/RPMS/openssh-clients-3.4p1-1.1mdk.ppc.rpm
09cd66300f813b02b8fce596c6f41890
ppc/8.0/RPMS/openssh-server-3.4p1-1.1mdk.ppc.rpm
ae7d14d39519c7a8cf24fb972dabf64b ppc/8.0/SRPMS/openssh-3.4p1-1.1mdk.src.rpm

Mandrake Linux 8.1:
5e47e247a168672d615427ac6f61c3a6 8.1/RPMS/openssh-3.4p1-1.1mdk.i586.rpm
44c89f022f7c90f12368ff005d66c9ec
8.1/RPMS/openssh-askpass-3.4p1-1.1mdk.i586.rpm
44fe74f64e80e10381e3f45849cf6be2
8.1/RPMS/openssh-askpass-gnome-3.4p1-1.1mdk.i586.rpm
fe3a4fd14350f127a294b876273a0f34
8.1/RPMS/openssh-clients-3.4p1-1.1mdk.i586.rpm
569aa9e54a78d43262160453c7ae49ae
8.1/RPMS/openssh-server-3.4p1-1.1mdk.i586.rpm
ae7d14d39519c7a8cf24fb972dabf64b 8.1/SRPMS/openssh-3.4p1-1.1mdk.src.rpm

Mandrake Linux 8.1/ia64:
5cc0fed5617222e4e634552e03a4d22e ia64/8.1/RPMS/openssh-3.4p1-1.1mdk.ia64.rpm
93807a0abdaed2616321ac6195d49526
ia64/8.1/RPMS/openssh-askpass-3.4p1-1.1mdk.ia64.rpm
89c005ac1d2688ad1ff5f4907dcc6fab
ia64/8.1/RPMS/openssh-askpass-gnome-3.4p1-1.1mdk.ia64.rpm
0e1fb743c423e72a5a4c8337597ec84c
ia64/8.1/RPMS/openssh-clients-3.4p1-1.1mdk.ia64.rpm
138c3d91c25d4b87a274dfae70ed848a
ia64/8.1/RPMS/openssh-server-3.4p1-1.1mdk.ia64.rpm
ae7d14d39519c7a8cf24fb972dabf64b ia64/8.1/SRPMS/openssh-3.4p1-1.1mdk.src.rpm

Mandrake Linux 8.2:
7bedf2566a7b316ab6310f4423bcc19c 8.2/RPMS/openssh-3.4p1-1.1mdk.i586.rpm
75c38336dab4afe6e82f18027fd5d0d1
8.2/RPMS/openssh-askpass-3.4p1-1.1mdk.i586.rpm
d2c1605bbbe408e11485024f0693d048
8.2/RPMS/openssh-askpass-gnome-3.4p1-1.1mdk.i586.rpm
c887fa3ed238871954e4f699549dec38
8.2/RPMS/openssh-clients-3.4p1-1.1mdk.i586.rpm
adbca15c1f900be940dca2bafb26c1a6
8.2/RPMS/openssh-server-3.4p1-1.1mdk.i586.rpm
ae7d14d39519c7a8cf24fb972dabf64b 8.2/SRPMS/openssh-3.4p1-1.1mdk.src.rpm

Mandrake Linux 8.2/ppc:
7a2a5a4a74c2e91dc360fe2cf6151989 ppc/8.2/RPMS/openssh-3.4p1-1.1mdk.ppc.rpm
7106102c019293674dc192afc09d1d88
ppc/8.2/RPMS/openssh-askpass-3.4p1-1.1mdk.ppc.rpm
697394feb5f4798f72d09b628958dad2
ppc/8.2/RPMS/openssh-askpass-gnome-3.4p1-1.1mdk.ppc.rpm
d95119ce24e9956832b38127a7834203
ppc/8.2/RPMS/openssh-clients-3.4p1-1.1mdk.ppc.rpm
dde7572585137865bcfd634dd1047963
ppc/8.2/RPMS/openssh-server-3.4p1-1.1mdk.ppc.rpm
ae7d14d39519c7a8cf24fb972dabf64b ppc/8.2/SRPMS/openssh-3.4p1-1.1mdk.src.rpm

Corporate Server 1.0.1:
75796ca71eb402f9857a9bf3831e740e 1.0.1/RPMS/openssh-3.4p1-1.2mdk.i586.rpm
817f59a4caa30308a4d98e7dba3bcc54
1.0.1/RPMS/openssh-askpass-3.4p1-1.2mdk.i586.rpm
fbf725ecad88b921084404187849648a
1.0.1/RPMS/openssh-askpass-gnome-3.4p1-1.2mdk.i586.rpm
d842f525ade248caea8ea418d232abc6
1.0.1/RPMS/openssh-clients-3.4p1-1.2mdk.i586.rpm
b07c97c93bf04d48099024c7a70bae66
1.0.1/RPMS/openssh-server-3.4p1-1.2mdk.i586.rpm
2b059962de52e888584c0260e983cf19 1.0.1/SRPMS/openssh-3.4p1-1.2mdk.src.rpm

Single Network Firewall 7.2:
a641fdf0dc7d21ad0aa5a4a9bc61729a snf7.2/RPMS/openssh-3.4p1-1.2mdk.i586.rpm
0dad80e92b95d7b40d7758922c4bf858
snf7.2/RPMS/openssh-askpass-3.4p1-1.2mdk.i586.rpm
fe7bbbef4078e47260a47c7cafb3d289
snf7.2/RPMS/openssh-askpass-gnome-3.4p1-1.2mdk.i586.rpm
d88bb474b91125fbd65eb680b19298f0
snf7.2/RPMS/openssh-clients-3.4p1-1.2mdk.i586.rpm
45891af293f145f5a7029d77803b0e03
snf7.2/RPMS/openssh-server-3.4p1-1.2mdk.i586.rpm
2b059962de52e888584c0260e983cf19 snf7.2/SRPMS/openssh-3.4p1-1.2mdk.src.rpm
________________________________________________________________________

Bug IDs fixed (see https://qa.mandrakesoft.com for more information):

________________________________________________________________________

To upgrade automatically, use MandrakeUpdate. The verification of md5
checksums and GPG signatures is performed automatically for you.

If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm". A list of
FTP mirrors can be obtained from:

http://www.mandrakesecure.net/en/ftp.php

Please verify the update prior to upgrading to ensure the integrity of
the downloaded package. You can do this with the command:

rpm --checksig

All packages are signed by MandrakeSoft for security. You can obtain
the GPG public key of the Mandrake Linux Security Team from:

https://www.mandrakesecure.net/RPM-GPG-KEYS

Please be aware that sometimes it takes the mirrors a few hours to
update.

You can view other update advisories for Mandrake Linux at:

http://www.mandrakesecure.net/en/advisories/

MandrakeSoft has several security-related mailing list services that
anyone can subscribe to. Information on these lists can be obtained by
visiting:

http://www.mandrakesecure.net/en/mlist.php

If you want to report vulnerabilities, please contact

[email protected]


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