<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="200909-01"> <title>Linux-PAM: Privilege escalation</title> <synopsis> An error in the handling of user names of Linux-PAM might allow remote attackers to cause a Denial of Service or escalate privileges. </synopsis> <product type="ebuild">pam</product> <announced>2009-09-07</announced> <revised count="01">2009-09-07</revised> <bug>261512</bug> <access>remote</access> <affected> <package name="sys-libs/pam" auto="yes" arch="*"> <unaffected range="ge">1.0.4</unaffected> <vulnerable range="lt">1.0.4</vulnerable> </package> </affected> <background> <p> Linux-PAM (Pluggable Authentication Modules) is an architecture allowing the separation of the development of privilege granting software from the development of secure and appropriate authentication schemes. </p> </background> <description> <p> Marcus Granado repoted that Linux-PAM does not properly handle user names that contain Unicode characters. This is related to integer signedness errors in the pam_StrTok() function in libpam/pam_misc.c. </p> </description> <impact type="normal"> <p> A remote attacker could exploit this vulnerability to cause a Denial of Service. A remote authenticated attacker could exploit this vulnerability to log in to a system with the account of a user that has a similar user name, but with non-ASCII characters. </p> </impact> <workaround> <p> There is no known workaround at this time. </p> </workaround> <resolution> <p> All Linux-PAM users should upgrade to the latest version: </p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=sys-libs/pam-1.0.4"</code> </resolution> <references> <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0887">CVE-2009-0887</uri> </references> <metadata tag="requester" timestamp="2009-07-10T18:01:34Z"> craig </metadata> <metadata tag="submitter" timestamp="2009-08-28T16:33:27Z"> a3li </metadata> <metadata tag="bugReady" timestamp="2009-08-31T03:38:46Z"> a3li </metadata> </glsa>