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TITLE:
Linux-PAM "pam_env" Module Two Vulnerabilities

SECUNIA ADVISORY ID:
SA46583

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/46583/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=46583

RELEASE DATE:
2011-10-29

DISCUSS ADVISORY:
http://secunia.com/advisories/46583/#comments

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http://secunia.com/advisories/46583/

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https://ca.secunia.com/?page=viewadvisory&vuln_id=46583

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http://secunia.com/vulnerability_scanning/personal/
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DESCRIPTION:
Two vulnerabilities have been reported in Linux-PAM, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service) and potentially gain escalated privileges.

1) A boundary error within the "_assemble_line()" function
(modules/pam_env/pam_env.c) of the "pam_env" module can be exploited
to cause a stack-based buffer overflow via e.g. a specially crafted
"~/.pam_environment" file.

2) The "_expand_arg()" function (modules/pam_env/pam_env.c) of the
"pam_env" module does not properly abort when encountering certain
conditions during the expansion of environment variables, which can
be exploited to e.g. cause a high CPU consumption via specially
crafted environment variables.

The vulnerabilities are reported in version 1.1.4. Other versions may
also be affected.

SOLUTION:
Fixed in the GIT repository.

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
Kees Cook

ORIGINAL ADVISORY:
http://git.fedorahosted.org/git/?p=linux-pam.git;a=commitdiff;h=caf5e7f61c8d9288daa49b4f61962e6b1239121d
http://git.fedorahosted.org/git/?p=linux-pam.git;a=commitdiff;h=109823cb621c900c07c4b6cdc99070d354d19444

https://bugs.launchpad.net/ubuntu/+source/pam/+bug/874469
https://bugs.launchpad.net/ubuntu/+source/pam/+bug/874565

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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