AlpacaHack Logo

Challenges

Sign InSign Up

Rows:

CHALLENGEAUTHORS

SOLVES

(CURRENT)

SOLVE RATE

(AT CONTEST TIME)

Welcome
Misc

admin

1326

solves

-

Daily AlpacaHack

892

solves

-

Daily AlpacaHack

577

solves

-

AlpacaHack Round 2 (Web)

536

solves

Top 28%

= 84/300 users

Daily AlpacaHack

413

solves

-

Daily AlpacaHack

386

solves

-

Daily AlpacaHack

351

solves

-

echo
Pwn

AlpacaHack Round 1 (Pwn)

322

solves

Top 32%

= 56/174 users

Daily AlpacaHack

271

solves

-

AlpacaHack Round 7 (Web)

255

solves

Top 15%

= 71/458 users

Daily AlpacaHack

245

solves

-

qrime
Crypto

AlpacaHack Round 3 (Crypto)

241

solves

Top 38%

= 91/239 users

Daily AlpacaHack

241

solves

-

Daily AlpacaHack

241

solves

-

Daily AlpacaHack

240

solves

-

Daily AlpacaHack

234

solves

-

Daily AlpacaHack

218

solves

-

CakeCTF 2023

213

solves

Top 33%

= 246/729 teams

Daily AlpacaHack

213

solves

-

Daily AlpacaHack

213

solves

-

Rows:

jailiaj

Daily AlpacaHack
158 solves
Misc

Author:

ใƒณใ‚ณใ‚ฝใƒ‘ใƒˆใƒžใƒˆใƒ‘ใ‚ฝใ‚ณใƒณ

ๅˆๅฟƒ่€…ๅ‘ใ‘ใƒ’ใƒณใƒˆ: Jail ใจใฏ
  • AlpacaHack ใงใฏ็พๅœจใ€ Crypto, Pwn, Rev, Web ใฎ 4 ใคใฎใ‚ซใƒ†ใ‚ดใƒชใƒผใ‚’ไธญๅฟƒใซๅ‡บ้กŒใ—ใ€ใใ‚Œไปฅๅค–ใฎๅˆ†้‡Žใฎๅ•้กŒใฏ Misc ใ‚ซใƒ†ใ‚ดใƒชใƒผใซๅˆ†้กžใ—ใฆใ„ใพใ™ใ€‚
  • ใ“ใฎๅ•้กŒใฏ Misc ใ‚ซใƒ†ใ‚ดใƒชใƒผใซๅฑžใ—ใ€ใใฎไธญใงใ‚‚ Jail ใจๅ‘ผใฐใ‚Œใ‚‹ๅ•้กŒใฎไธ€ใคใงใ™ใ€‚
  • Jail ใฏ SECCON ไบˆ้ธใ‚’ใฏใ˜ใ‚ใ€็‹ฌ็ซ‹ใ—ใŸใ‚ซใƒ†ใ‚ดใƒชใƒผใจใ—ใฆๅ‡บ้กŒใ•ใ‚Œใ‚‹ใ“ใจใ‚‚ใ‚ใ‚Šใพใ™ใ€‚
  • Jail ใจใฏใ€ใ€Œไฝ•ใ‹ใ—ใ‚‰ๅˆถ้™ใ•ใ‚ŒใŸๅฎŸ่กŒ็’ฐๅขƒ๏ผˆ๏ผjail๏ผ‰ใ‹ใ‚‰่„ฑๅ‡บใ™ใ‚‹ใ€ใ“ใจใ‚’ใƒ†ใƒผใƒžใจใ—ใพใ™ใ€‚
  • ไธŽใˆใ‚‰ใ‚ŒใŸ็’ฐๅขƒใ‚„ๅˆถ้™ใŒๅฎŒๅ…จใงใฏใชใ„็‚นใ‚’็ชใใ€ๆƒณๅฎšๅค–ใฎๆ“ไฝœใ‚’้”ๆˆใงใใ‚Œใฐใ€ใƒ•ใƒฉใ‚ฐใ‚’ๅพ—ใ‚‹ใ“ใจใŒใงใใพใ™ใ€‚
  • ็‰นใซ Python ใฎ่จ€่ชžไป•ๆง˜ใซ้–ข้€ฃใ™ใ‚‹ Jail ๅ•้กŒใฏ Pyjail ใจๅ‘ผใฐใ‚Œใพใ™ใ€‚
ๅˆๅฟƒ่€…ๅ‘ใ‘ใƒ’ใƒณใƒˆ: ๆœ€ๅˆใฎใ‚นใƒ†ใƒƒใƒ—
  • ใ‚นใ‚ฏใƒชใƒ—ใƒˆใ‚’่ชญใ‚€ใจใ€ๅ…ฅๅŠ›ใŒๅ›žๆ–‡ใ‹ใฉใ†ใ‹ใ‚’ใƒใ‚งใƒƒใ‚ฏใ—ใŸๅพŒใ€ใใฎๅ…ฅๅŠ›ใ‚’ eval ใงๅฎŸ่กŒใ—ใฆใ„ใ‚‹ใ“ใจใŒใ‚ใ‹ใ‚Šใพใ™ใ€‚
  • flag.txt ใฏ Dockerfile ใง ./flag.txt ใซ้…็ฝฎใ•ใ‚Œใพใ™ใ€‚
  • ใพใšใ€ใ“ใฎๅ•้กŒใ‚ˆใ‚Š็ฐกๅ˜ใชใ€Œๅ›žๆ–‡ใƒใ‚งใƒƒใ‚ฏใฎ assert ๆ–‡ใŒใชใ„ใ€ๆกไปถใง่€ƒใˆใฆใฟใพใ—ใ‚‡ใ†ใ€‚
  • ใใฎๅ ดๅˆใ€ๅ˜ใซ print(open("flag.txt").read()) ใ‚’ๅ…ฅๅŠ›ใ™ใ‚‹ใ ใ‘ใงใ€ใƒ•ใƒฉใ‚ฐใ‚’่ชญใ‚€ใ“ใจใŒใงใใพใ™ใ€‚
  • ใ€Œใฉใ†ใ—ใŸใ‚‰ๅ›žๆ–‡ใฎใƒšใ‚คใƒญใƒผใƒ‰ใ‚’ๆง‹ๆˆใงใใ‚‹ใ‹ใ€ใจใ„ใ†็‚นใ‚’ๆ„่ญ˜ใ—ใชใŒใ‚‰ใ€Python ใฎ่จ€่ชžไป•ๆง˜ใ‚’่ชฟในใŸใ‚Šใ€ๆ‰‹ๅ…ƒใง่‰ฒใ€…ๅฎŸ้จ“ใ—ใฆๆŒ™ๅ‹•ใ‚’็ขบ่ชใ—ใŸใ‚Šใ—ใฆใฟใพใ—ใ‚‡ใ†ใ€‚
jailiaj.tar.gz
descriptionsolveswriteups