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Re: numerous free/paid account systems are vulnerable to privledgeselevation attacks
From: Pavel Korovin <pvk () TSINET RU>
Date: Sun, 12 Nov 2000 22:06:37 +0300

Michal Zalewski (lcamtuf () DIONE IDS PL) wrote:

Mkey. During futher investigations I've found recent RH releases (6.2 and
7.0) seems to be not affected by this problem. But, as numerous systems
are still based on older releases, and there were no security advisories
on this silently fixed problem, shadow-utils might be still used in
previous versions. I am, in fact, still using the old package, and haven't
checked for the updates (sorry). This does not change the fact numerous
systems are vulnerable.

- Debian 2.2 - not vulnerable
- RedHat below 6.2 - vulnerable
- RedHat 6.2, 7.0 - not vulnerable
- Cobalt Linux - vulnerable
- other distros? I would suspect Corel Linux, SuSE, Mandrake...
- OpenBSD - seems to be vulnerable, no details

Yes, recent installations might be not vulnerable. Distros with RH-alike
shadow-utils configuration and without the patch mentioned here by
Bernhard Rosenkraenzer, are vulnerable. Other systems, like OpenBSD, might
allow such attacks.

OpenBSD useradd(8) utility is not affected.
adduser(8) is affected, but I think this is sysadmin's deal not be cought
in such trap.

Pavel Korovin
 SMTP: pvk () tsinet ru

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