Malwarebytes Racing to Fix Its Own Security Flaw
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If you use Malwarebytes Anti-Malware to protect your computer, make sure you update it during the next month to patch a nasty flaw. Shares A good anti-malware program can clean up your computer after a malicious attack, but what happens when your anti-malware program itself is a possible point of intrusion?
The developers of Malwarebytes Anti-Malware, a well-liked anti-malware application, are in the process of patching potentially severe security flaws in both the software’s free and paid versions that the Malwarebytes company has known about since November. Image credit: Malwarebytes Mascot Photo Credit: Malwarebytes If you use the free Malwarebytes Anti-Malware to clean up your computer, or its paid version, Malwarebytes Anti-Malware Premium which is full-fledged, proactive antivirus software , to protect your computer, make sure you keep it updated assiduously during the next month.
Malwarebytes expects to have version 2. In November, a prominent Google security researcher named Tavis Ormandy privately told Malwarebytes about four vulnerabilities in Malwarebytes Anti-Malware that range between “nearly harmless” and “fairly severe,” depending on how you define these things.
Best Antivirus Software and Apps Now that 90 days has passed since the private disclosure, Ormandy has gone public, and detailed how the flaws work, in a Google Security Research posting.
Kleczynski was more reticent, for obvious reasons. Most antivirus firms do the same. This means that a dedicated cybercriminal could launch a man-in-the-middle attack on the data transmission, engineering his or her own phony update and using it to infect or hijack a computer via the very program intended to stop or recover from such attacks. Malwarebytes does encrypt the code that’s sent via the unencrypted transmission protocol, but Ormandy showed that the code would be trivial to decrypt.
The other flaws stem from sloppy coding. All software has access control lists ACLs that determine which users or processes can read, write, execute or delete files; Malwarebytes’ ACLs are too loose, letting anyone take full control of the program. The software also doesn’t adequately limit revisions to its own code, and doesn’t limit what kind of customized cleanup processes can be created, making it easy to add or insert malicious code. In his blog posting, Kleczynski implied that the flaws may not be quite as catastrophic as they sound, saying that “we believe that [inserting malicious code] could only be done by targeting one machine at a time.
Nonetheless, Kleczynski recommended that users of Malwarebytes Anti-Malware Premium enable the self-protection module in the settings menu, which should prevent unauthorized program updates. Malwarebytes Free users will simply have to wait the three or four weeks until the patch becomes available. If you’re extremely paranoid — and you might be justified, since skilled coders will be able to reverse-engineer Ormandy’s findings — you can eschew malware signature updates altogether during that time, although doing so would somewhat defeat the purpose of having an anti-malware program.
Bear in mind that the free version of Malwarebytes Anti-Malware is not antivirus software, and does nothing to protect your computer from attack. It’s only a cleanup tool. We like Malwarebytes Anti-Malware and recommend its use, but it must always be used alongside a true antivirus program, whether that’s Windows Defender or better yet a third-party alternative.
Keeping programs up-to-date is usually one of the best defenses against malware, but there’s always an exception that proves the rule. In the meantime, Kleczynski encouraged security researchers to keep hunting for bugs, for which they can now receive moderate payouts under the just-launched Malwarebytes Bug Bounty program.
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