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[+] Credits: John Page AKA Hyp3rlinx [+] Website: hyp3rlinx.altervista.org [+] Source: http://hyp3rlinx.altervista.org/advisories/SAWMILL-PASS-THE-HASH-AUTHENTICATION-BYPASS.txt [+] ISR: ApparitionSec Vendor: =============== www.sawmill.net Product: ======================== Sawmill Enterprise v8.7.9 sawmill8.7.9.4_x86_windows.exe hash: b7ec7bc98c42c4908dfc50450b4521d0 Sawmill is a powerful heirarchical log analysis tool that runs on every major platform. Vulnerability Type: =================================== Pass the Hash Authentication Bypass CVE Reference: ============== CVE-2017-5496 Security Issue: ===================== Sawmill suffers from a classic "Pass The Hash" vulnerability whereby an attacker who gains access to the hashed user account passwords can login to the Sawmill interface using the raw MD5 hash values, allowing attackers to bypass the work of offline cracking account password hashes. This issue usually is known to affect Windows systems e.g. (NT Pass the Hash/Securityfocus, 1997). However, this vulnerability can also present itself in a vulnerable Web application. Sawmill account password hashes are stored under LogAnalysisInfo/ directory in "users.cfg". e.g. users = { root_admin = { username = "admin" password_checksum = "e99a18c428cb38d5f260853678922e03" email_address = "" This config file is stored local to the Sawmill application. However, if an attacker gains access to a backup of the config that is stored in some other location that is then compromised, it can lead to subversion of Sawmills authenticaton process. Moreover, since 'users.cfg' file is world readble a regular non Admin Windows user who logs into the system running sawmill can now grab a password hash and easily login to the vulnerable application without the needing the password itself. How to test? Sawmill running (default port 8988), log off Windows and switch to a "Standard" Windows non Administrator user. 1) Open "users.cfg" under Sawmills directory "C:\Program Files\Sawmill 8\LogAnalysisInfo" and copy the root_admin Admin password hash. 2) Go to the Sawmill login page in web browser http://VICTIM-IP:8988/ enter username 'admin' and the hash, Tada! your Admin. Finally, Sawmill passwords are hashed using vulnerable MD5 algorithm and no salt. e.g. password: abc123 MD5 hash: e99a18c428cb38d5f260853678922e03 Disclosure Timeline: ===================================== Vendor Notification: January 7, 2017 CVE-2017-5496 assigned : January 20 Request status : January 26 Vendor: Fix avail later in year still no ETA Inform vendor public disclose date February 18, 2017 : Public Disclosure Network Access: =============== Remote Impact: ====================== Information Disclosure Privilege Escalation Severity Level: ================ High [+] 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. |
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