REDHAT-BUG-641335

First published: Fri Oct 08 2010(Updated: )

It was reported that pam_env and pam_mail modules do not drop privileges before accessing users' files. This flaw can lead to information disclosure. Issue was partially addressed in Linux-PAM 1.1.2: <a href="http://git.altlinux.org/people/ldv/packages/?p=pam.git;a=commitdiff;h=06f882f30092a39a1db867c9744b2ca8d60e4ad6">http://git.altlinux.org/people/ldv/packages/?p=pam.git;a=commitdiff;h=06f882f30092a39a1db867c9744b2ca8d60e4ad6</a> The fix in 1.1.2 has some problems though, it fails to switch fsgid/egid and groups (<a href="https://access.redhat.com/security/cve/CVE-2010-3430">CVE-2010-3430</a>) and does not check setfsuid() return value (<a href="https://access.redhat.com/security/cve/CVE-2010-3431">CVE-2010-3431</a>): <a href="http://thread.gmane.org/gmane.comp.security.oss.general/3311/focus=3551">http://thread.gmane.org/gmane.comp.security.oss.general/3311/focus=3551</a> 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: <a href="http://git.altlinux.org/people/ldv/packages/?p=pam.git;a=commitdiff;h=843807a3a90f52e7538be756616510730a24739a">http://git.altlinux.org/people/ldv/packages/?p=pam.git;a=commitdiff;h=843807a3a90f52e7538be756616510730a24739a</a> Acknowledgements: Red Hat would like to thank Sebastian Krahmer of the SuSE Security Team for reporting this issue.

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