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Samba SMB1 Vulnerability; Patch Now or Disable If Possible

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Samba, a popular implementation of the SMB networking protocol shared by various Linux distributions, has been found vulnerable, potentially letting cybercriminals remotely control victims. All versions starting with version 4.0 from 2012 seem to have been affected by the issue.

The vulnerability exploits the way heap memory is deallocated, potentially enabling attackers to place and execute malicious code at their own discretion, by manipulating SMB1 requests sent to the SMB server.

“All versions of Samba from 4.0.0 onwards are vulnerable to a use after free vulnerability, where a malicious SMB1 request can be used to control the contents of heap memory via a deallocated heap pointer,” reads the advisory. “It is possible this may be used to compromise the SMB server.”

Fixes addressing the vulnerable Samba distributions were released on November 21st, encouraging everyone affected to either upgrade to newer Samba versions or download and install the new patches immediately.

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