Critical Tinyproxy Bug Alert: Patch Your Servers, Avoid RCE Chaos!

Tinyproxy’s got a big problem: 52,000 instances open to hackers due to a critical RCE flaw. But fear not, a patch is finally here—just don’t ask how it was disclosed!

Hot Take:

Well, well, well, what do we have here? Tinyproxy, the little server that could, chugging along on the internet, vulnerable as a newborn fawn in hunting season. Who knew that a tiny proxy could cause such a big fuss? Cisco Talos plays the bug hunter, the proxy devs play hide and seek with emails, and the internet collectively facepalms at yet another “Who forgot to patch their server?” rodeo. It’s like a digital Wild West out here, folks, and CVE-2023-49606 is the new wanted poster in town.

Key Points:

  • Tinyproxy had a “whoopsie daisy” with a critical RCE flaw, CVE-2023-49606, affecting versions 1.11.1 and 1.10.0.
  • Researchers at Cisco Talos blew the whistle but got ghosted by the proxy devs.
  • A whopping 52,000-ish Tinyproxy instances were left hanging in the breeze, ripe for the hacking.
  • After a game of email tag gone wrong, Tinyproxy maintainers finally patched the issue following public disclosure.
  • Despite the fix, the saga continues with a sprinkle of developer drama and a dash of potential exploit teases.
Cve id: CVE-2023-49606
Cve state: PUBLISHED
Cve assigner short name: talos
Cve date updated: 05/01/2024
Cve description: A use-after-free vulnerability exists in the HTTP Connection Headers parsing in Tinyproxy 1.11.1 and Tinyproxy 1.10.0. A specially crafted HTTP header can trigger reuse of previously freed memory, which leads to memory corruption and could lead to remote code execution. An attacker needs to make an unauthenticated HTTP request to trigger this vulnerability.

Need to know more?

Proxy in Peril

Imagine Tinyproxy as that small, unassuming sidekick character in every heist movie that somehow ends up with the keys to the kingdom. Well, the kingdom is in peril, my friends. Cisco's Talos squad found a critical RCE bug that could let attackers crash the party without an invite. They even provided a proof-of-concept exploit that's like a party trick gone wrong, potentially handing over the server's reins to the unscrupulous lot.

Ghosted by Ghosts in the Machine

Here's the kicker: Cisco tried to tap Tinyproxy on the shoulder about this digital sinkhole, and lo and behold, they got the cold shoulder. No response, nada, zilch. It's like leaving a "URGENT: Your server might implode" note on someone's desk and they use it as a coffee coaster. And thanks to this silent treatment, a patch was as elusive as a unicorn in a haystack.

The Digital Census Takers

Enter Censys, the digital census takers, tallying up the internet-exposed Tinyproxy instances like a nosy neighbor counting cars in your driveway. They found that out of 90,000 instances, more than half needed a serious security makeover. The U.S. took the lead in the "most likely to get hacked" category, with South Korea and China trailing behind.

Fixing the Unseen

When the fix finally came, it was like a belated birthday present that you already bought for yourself. Tinyproxy maintainers released a patch faster than you can say "use-after-free vulnerability," but not without throwing some shade at Cisco for their apparent game of email hide-and-seek. They claimed the bug report was like a message in a bottle lost at cyber sea, never reaching their shores via the proper channels.

Drama in Dev Land

The plot thickens as the maintainers of Tinyproxy aired their grievances on GitHub like a public laundry service. Accusations flew like pigeons in a park: missed emails, ignored protocols, and a slow-to-react maintainer informed by a third-party via IRC. Meanwhile, the developers reassured everyone that while the bug was indeed "nasty," the chances of a wild exploit galloping through the net were still up in the air.

With the updated code, only those with VIP access after authentication could potentially exploit the flaw, offering a tiny (pun intended) silver lining. So, if you're using Tinyproxy within a controlled environment, you might just be safer than a snail in a shell—unless you forgot that pesky little thing called a patch.

Tags: CVE-2023-49606, HTTP proxy server, memory management vulnerabilities, Open-source software, Remote Code Execution, software patch updates, Tinyproxy