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Bug 641361 - (CVE-2010-3430, CVE-2010-3431) CVE-2010-3430 CVE-2010-3431 pam: pam_mail and pam_env incorrect privilege dropping
CVE-2010-3430 CVE-2010-3431 pam: pam_mail and pam_env incorrect privilege dro...
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,source=oss-security,r...
: Security
Depends On:
Blocks: CVE-2010-3435
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Reported: 2010-10-08 10:16 EDT by Tomas Hoger
Modified: 2015-07-31 02:32 EDT (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2010-12-22 10:45:16 EST
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RHEL 7.3 requirements from Atomic Host:


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Description Tomas Hoger 2010-10-08 10:16:04 EDT
The pam_mail and pam_env modules in Linux-PAM before 1.1.2 did not drop privileges before accessing users' files (CVE-2010-3435, see bug #641335).  Privilege dropping was added in 1.1.2, but with couple of issues pointed out by Solar Designer:

http://thread.gmane.org/gmane.comp.security.oss.general/3311/focus=3534

The code fails to switch fsgid/egid and groups (CVE-2010-3430) and does not check setfsuid() return value (CVE-2010-3431).  Fix using newly-introduced pam_modutil_drop_priv / pam_modutil_regain_priv was committed in upstream CVS and should be included in 1.1.3:
http://git.altlinux.org/people/ldv/packages/?p=pam.git;a=commitdiff;h=843807a3a90f52e7538be756616510730a24739a
Comment 1 Tomas Hoger 2010-10-08 10:19:01 EDT
Linux-PAM 1.1.2 is currently only available in Fedora Rawhide.  Older PAM versions do to contain affected privilege dropping code and hence can not be affected by these issues.  The are affected by the original issue - CVE-2010-3435.

Statement:

Not vulnerable. This issue did not affect the versions of pam as shipped with Red Hat Enterprise Linux 3, 4, 5, or 6.

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