CVE-2019-17067

PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incoming…

published October 1, 2019

CVSS
—
EPSS
2%
Percentile
76.1
In the wild
Unconfirmed
What it is

⚠️ A misconfigured port-forwarding feature in PuTTY could let attackers eavesdrop on connections as easily as tuning into the wrong radio station! 🔊 Think of it like a telephone line where one person is supposed to listen to a specific call, but someone else can just pick up the line and hear everything. That's what happens when PuTTY opens those listening sockets improperly—anyone could catch that connection! If exploited, an attacker could listen in on sensitive data being transferred over the same port, potentially leading to account compromise or data theft. This vulnerability could allow unauthorized access to private communications without the victim's knowledge, causing major security headaches!

Put simply

Think of it like a telephone line where one person is supposed to listen to a specific call, but someone else can just pick up the line and hear everything. That's what happens when PuTTY opens those listening sockets improperly—anyone could catch that connection! This vulnerability arises from PuTTY's failure to properly handle port-forwarding listening sockets, allowing malicious actors to intercept incoming connections on those sockets, leading to potential data exposure.

What to do

If exploited, an attacker could listen in on sensitive data being transferred over the same port, potentially leading to account compromise or data theft. This vulnerability could allow unauthorized access to private communications without the victim's knowledge, causing major security headaches! Update PuTTY to version 0.73 or later to ensure proper handling of port-forwarding listening sockets. Additionally, review your configurations to prevent unauthorized access and consider using more secure alternatives if necessary. You've got this! Patch up your PuTTY and keep your connections secure. 🛡️

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01634 · 76.1th percentile
Published
2019-10-01T16:55Z
EPSS history
Timeline
  • 01 OCT 16:55Z
    PuTTY before 0.73 on Windows improperly opens port-forwarding listening sockets, which allows attackers to listen on the same port to steal an incoming…
    cvelistv5