Bug 641361 (CVE-2010-3430, CVE-2010-3431)

Summary:	CVE-2010-3430 CVE-2010-3431 pam: pam_mail and pam_env incorrect privilege dropping
Product:	[Other] Security Response	Reporter:	Tomas Hoger <thoger>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	tmraz
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
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Clone Of:		Environment:
Last Closed:	2010-12-22 15:45:16 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	641335

Description Tomas Hoger 2010-10-08 14:16:04 UTC

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 14:19:01 UTC

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.