Let’s X-ray SCMagazine…

[This was originally published on the OSVDB blog.]

Hopefully a really quick blog, but a section of a news article titled “Hackers are having a field day with stolen credentials” by Amol Sarwate, Qualys’ Director of Vulnerability Labs, published in SC Magazine caught my attention. The section:

Let’s X-ray the attack methods

Typically, hackers “fingerprint” websites’ underlying software, such as their blog content management system or discussion forum application, and exploit either known vulnerabilities the website owner left unpatched or zero-day flaws.

In one case, an attacker used misplaced install files to gain admin privileges. In another case, hackers stole one moderator’s credentials and used the account to post a malicious message in the forum. After viewing the message, the forum’s administrator had his account compromised, leading to a massive breach. Notable vulnerabilities exploited in recent years include CVE-2016-6483, CVE-2016-6195, CVE-2016-6635, CVE-2015-1431, CVE-2015-7808, CVE-2014-9574 and CVE-2013-6129.

Specifically, that list of CVE identifiers. First, a random list of CVE IDs and they don’t even link to the entries on the CVE or NVD site. It’s not like anyone will instantly recognize those and equate them to specific vulnerabilities, and the odds of someone cutting and pasting them into Google are slim. Second, in the context mentioned, talking about exploiting web sites, then mentioning stealing credentials and account compromise, the list is peculiar. Looking them up in VulnDB:

142673 2016-08-01 2016-6483 vBulletin /link/getlinkdata Server-side Request Forgery (SSRF)
141687 2016-07-11 2016-6195 vBulletin forumrunner/includes/moderation.php Multiple Parameter SQL Injection
137861 2016-03-30 2016-6635 WordPress wp-admin/includes/ajax-actions.php Script Compression Option CSRF
129847 2015-11-02 2015-7808 vBulletin /vbforum/ajax/api/hook/decodeArguments arguments Parameter Remote Code Execution
117888 2015-01-26 2015-1431 phpBB includes/startup.php Trailing Path Handling CSS Injection
116744 2014-12-31 2014-9574 FluxBB /install.php require() Function install_lang Parameter Path Traversal Local File Inclusion
98370 2013-10-09 2013-6129 vBulletin install/upgrade.php Configuration Mechanism Admin Account Creation

A few observations:

  • While SSRF can be an underlooked vulnerability, it often leads to remote information disclosure about other hosts, not specifically the web site in Sarwate’s context.
  • SQL Injection we’d certainly expect to see and can have devastating consequences.
  • CSRF is another as it can be used to conduct privileged operations via phishing attacks.
  • Any Remote Code Execution issue is obviously a big one, and on widely deployed software like vBulletin it is expected on such a list.
  • CSS injection is an odd one too, as it is frequently considered less severe than XSS which doesn’t appear on the list at all, despite Sarwate describing an XSS in the example above.
  • While LFI can be a serious vuln, curious to see it here instead of a RFI which gives the attacker far more control and more reliably results in a compromise.
  • 2013-6129 was discovered in the wild and being actively exploited, so no surprise to see it in such a list. Curious it is from 2013 and there are no more recent examples he thought to use.
  • Seven issues, with varying degrees of severity, some that may not pose a serious risk to a web site, while leaving out XSS completely, an RCE in Joomla! that was being exploited in the wild, various WordPress plugins that allowed for RCE, etc.

Anyway, just found this list odd and figured it was worth the mention.

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