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1
2 STACK SMASHING PROTECTOR SSP SSP SSP egcs SSP C glibc glibc spec glibc SSP spec LIBSAFE LIBSAFE Libsafe RPM LIBSAFE LIBSAFE i
3 ii
4 1. Stack Smashing Protector Libsafe 2 2. Stack Smashing Protector Libsafe Stack Smashing Protector Libsafe C C Stack Smashing Protector
5 3. Stack Smashing Protector 3.1. Stack Smashing Protector SSP SSP SSP 3.2. SSP SSP SSP gcc gcc SSP gcc SSP SSP Red Hat Linux egcs p (gcc ) Intel SSP egcs p FreeBSD Red Hat 2 1 Red Hat Linux 6.2 egcs 2 Red Hat FreeBSD [1]. -2
6 SSP egcs SSP egcs SSP egcs egcs egcs 6. 1) egcs egcs ftp://ftp.redhat.com/pub/redhat/linux/6.2/ja/os/i386/srpms/egcs src.rpm # rpm -ivh egcs src.rpm egcs SPEC # ls /usr/src/redhat/sources egcs addressof.patch egcs asm.patch egcs cpu.patch egcs davem.patch egcs expr.patch egcs fold.patch egcs integrate.patch egcs linux.patch egcs strlen.patch egcs warn.patch egcs tar.bz2 egcs-libstdc++-compat.tar.gz egcs gcse.patch # ls /usr/src/redhat/specs egcs.spec. -3
7 2) SSP SSP SPEC # mv egcs.spec.patch /usr/src/redhat/specs SSP # mv egcs protector.patch /usr/src/redhat/sources 3) egcs (SPEC ) /usr/src/redhat/specs egcs # cd /usr/src/redhat/specs # patch p0 < egcs.spec.patch 4) egcs egcs # rpm -bb --buildpolicy redhat /usr/src/redhat/specs/egcs.spec. -4
8 # ls /usr/src/redhat/rpms/i386 cpp p.i386.rpm egcs p.i386.rpm egcs-g p.i386.rpm egcs-objc p.i386.rpm egcs-c p.i386.rpm libstdc p.i386.rpm 5) egcs egcs # rpm -Uvh --force /usr/src/redhat/rpms/i386/egcs p.i386.rpm 6) SSP gcc (test.c) #include <stdio.h> #include <string.h> #include <sys/types.h> #include <stdlib.h> char shellcode[] = " xeb x1f x5e x89 x76 x08 x31 xc0 x88 x46 x07 x89 x46 x0c xb0 x0b" " x89 xf3 x8d x4e x08 x8d x56 x0c xcd x80 x31 xdb x89 xd8 x40 xcd" " x80 xe8 xdc xff xff xff/bin/sh"; char large_string[128]; int contains_null_bytes(caddr_t addrp) { uint addr = (uint) addrp; return!(addr & 0xff && addr & 0xff00 && addr & 0xff0000 && addr & 0xff000000); }. -5
9 void foo() { char buffer[96], *p; int i; long *long_ptr = (long *) large_string; printf("press any key to continue..."); getchar(); for (p=buffer; contains_null_bytes(p); p++); if (contains_null_bytes(p)) { printf("we can't find an acceptable address that doesn't contain n"); printf("a zero byte. Giving up. n"); exit(-1); } for (i = 0; i < 32; i++) *(long_ptr + i) = (int) p; for (i = 0; i < sizeof(shellcode)-1; i++) { large_string[i] = shellcode[i]; } strcpy(p, large_string); return; } int main(int ac, char *av[]) { foo(); return 0; } % gcc -o test test.c %./test % tail -n 1 /var/log/message Jan 8 14:57:46 hostname test: stack smashing attack in function foo. -6
10 3.3. SSP C SSP C SSP gcc C C glibc glibc glibc glibc ftp://ftp.redhat.com/pub/redhat/linux/6.2/ja/os/i386/srpms/glibc src.rpm # rpm ivh glibc src.rpm # ls /usr/src/redhat/sources glibc tar.gz # ls /usr/src/redhat/specs glibc-2.1.spec glibc spec SSP glibc SPEC # mv glibc-2.1.spec.patch /usr/src/redhat/specs. -7
11 /usr/src/redhat/specs glibc # cd /usr/src/redhat/specs # patch p0 < glibc-2.1.spec.patch glibc SSP # mv glibc propolice.patch /usr/src/redhat/sources glibc glibc # rpm -bb --target i686-redhat-linux /usr/src/redhat/specs/glibc-2.1.spec # ls /usr/src/redhat/rpms/i386 glibc p.i386.rpm glibc-profile p.i386.rpm glibc-devel p.i386.rpm nscd p.i386.rpm glibc # rpm -Uvh --force /usr/src/redhat/rpms/i386/ glibc p.i386.rpm. -8
12 3.4. SSP SSP SSP gcc Linux ftp://ftp.redhat.com/pub/redhat/linux/6.2/ja/os/i386/srpms/kernel src.rpm # rpm ivh kernel src.rpm # ls /usr/src/redhat/sources README.kernel-sources ibcs tar.gz ibcs-2.1-locking.patch ibcs-2.1-rh.patch installkernel ipvs patch kernel-2.2-buildasm.sh kernel alpha-boot.config kernel alpha-smp.config kernel alpha.config kernel i386-boot.config kernel i386-smp.config kernel i386.config kernel i586-smp.config kernel i586.config kernel i686-smp.config linux ide-cd-shutup.patch linux ide-probe.patch linux iobuffix.patch linux ipvs-template.patch linux joyfix.patch linux lfs-headers.patch linux lfs.patch linux loop.patch linux lucent-hang.patch linux mediagx.patch linux megaraid.patch linux moremaestro.patch linux msdos-fixup.patch linux nautilus-srm.patch linux network-fixes.patch linux newagpdist.patch. -9
13 . -10 kernel i686.config linux nfs-fix.patch kernel propolice.patch linux nfsattack2.patch kernel sparc-boot.config linux nobfddep.patch kernel sparc-smp.config linux oom-hang.patch kernel sparc.config linux plip-fix.patch kernel sparc64-boot.config linux psi-update.patch kernel sparc64-smp.config linux rpc.patch kernel sparc64.config linux scsi-blacklist.patch ksymoops-0.7c.tar.gz linux scsi-devs.patch linux c90x.patch linux security-a1.patch linux piii-xor.patch linux security-a2.patch linux piii.patch linux security-a3.patch linux bigmem-initrd.patch linux security-a4.patch linux bigmem-raw.patch linux shmem-overwrite.patch linux cpq-mdh.patch linux sigio.patch linux ipvsfix.patch linux sigkill.patch linux limits.patch linux sk98-fix.patch linux peerbus.patch linux sound-update.patch linux symversion.patch linux sparc-config.patch linux ioapic.patch linux sparc-cpu-bug.patch linux aic7xxx patch linux sparc-cpu-bug2.patch linux aic7xxx patch linux sparc-cpu-bug3.patch linux aic7xxx patch linux sparc-fixes.patch linux aic7xxx patch linux sparc-lockd.patch linux aic7xxx patch linux sparc-mmap.patch linux aic7xxx patch linux sparc-nfs.patch linux alphamsnd.patch linux sparc-raid.patch linux bigmem-dcache.patch linux sparc-syscall.patch linux bigmem-no-lfs.patch linux sparcacenic.patch linux bigmem.patch linux sparcswift.patch linux smart patch linux sunpartshaddap.patch linux crash.patch linux sunqe.patch linux megaraid.patch linux timersync.patch linux acenic041.patch linux tar.gz linux agphjlfixes.patch linux-autoconf.h
14 linux aic7xxx patch linux-modversions.h linux alpha-exception.patch linux-version.h linux alpha-ramdisk.patch module-info linux alphasym.patch linux blkdev.patch linux bonding.patch linux cyclades-smp.patch linux duh.patch linux eepro100.patch linux eepropre7.patch linux elf-loader.patch linux emu10k1.patch linux fb-modules.patch pcmcia-cs network.script pcmcia-cs com.patch pcmcia-cs xircom.patch pcmcia-cs config.patch pcmcia-cs script.patch pcmcia-cs tar.gz raid b1.gz raw rh61.diff rhkmvtag.c linux i386-asm.patch # ls /usr/src/redhat/specs kernel spec spec SSP SPEC # mv kernel spec.patch /usr/src/redhat/specs. -11
15 /usr/src/redhat/specs # cd /usr/src/redhat/specs # patch p0 < kernel spec.patch SSP # mv kernel propolice.patch /usr/src/redhat/sources # rpm -bb --target i686-redhat-linux /usr/src/redhat/specs/kernel spec # ls /usr/src/redhat/rpms/i386 kernel-headers p.i386.rpm kernel-ibcs p.i386.rpm kernel-pcmcia-cs p.i386.rpm kernel-smp p.i386.rpm kernel-source p.i386.rpm kernel p.i386.rpm kernel-utils p.i386.rpm kernel-boot p.i386.rpm kernel-doc p.i386.rpm # rpm -Uvh --force /usr/src/redhat/rpms/i386/ kernel p.i386.rpm. -12
16 3.5. # rpm --rebuild buildpolicy redhat src_package_name c SSP gcc SSP mkisofs src.rpm popt src.rpm usernet src.rpm xpilot src.rpm. -13
17 4. Libsafe 4.1. Libsafe Libsafe C 4.2. Libsafe Libsafe Libsafe SSP Libsafe Libsafe Red Hat Linux Intel Libsafe
18 RPM Libsafe RPM Libsafe # rpm -ivh libsafe i386.rpm /lib/libsafe.so /usr/doc/libsafe-2.0 /usr/doc/libsafe-2.0/copying /usr/doc/libsafe-2.0/changelog /usr/doc/libsafe-2.0/ _notification /usr/doc/libsafe-2.0/install /usr/doc/libsafe-2.0/libprelude /usr/doc/libsafe-2.0/readme /usr/doc/libsafe-2.0/doc/* /usr/doc/libsafe-2.0/exploits/* /usr/doc/libsafe-2.0/tools/* /lib Libsafe /usr/doc/libsafe-2.0/exploit /usr/doc/libsafe-2.0/tools Libsafe RPM Libsafe Libsafe. -15
19 Libsafe Libsafe # /usr/doc/libsafe-2.0/tools/libsafe-install.sh -r Libsafe Libsafe % tar -zxvf libsafe tgz % cd libsafe % make % su root # make install Libsafe [y] [n] Type y for installing libsafe system wide?[default n] Libsafe /lib man RPM exploits tools. -16
20 4.3. Libsafe Libsafe libsafe-install.sh RPM /usr/doc/libsafe-2.0/tools tools # libsafe-install.sh -i -i -r LD_PRELOAD sh % LD_PRELOAD=/lib/libsafe.so.2 % export LD_PRELOAD csh % setenv LD_PRELOAD /lib/libsafe.so.2 LD_PRELOAD Libsafe. -17
21 setuid LD_PRELOAD setuid Libsafe Libsafe -fomit-frame-pointer 4.4. Libsafe Libsafe Libsafe Libsafe RPM /usr/doc/libsafe-2.0/exploits exploits % t1 strcpy sh Libsafe. -18
22 Libsafe Libsafe RPM /usr/doc/libsafe-2.0/exploits exploits % canary-exploit fprintf sh Libsafe. -19
23 . -20
24 5. Stack Smashing Protector Libsafe 2 DoS. -21
25 [1] How to build RedHat Linux with stack protection, [2] Manpage of Libsafe, [3], LinuxWORLD, 2002 Jun.. -22
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