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*
SAMBA BUG CAN LET REMOTE ATTACKERS EXECUTE CODE AS ROOT
By
SERGIU GATLAN
* January 31, 2022
* 04:15 PM
* 1
Samba has addressed a critical severity vulnerability that can let attackers
gain remote code execution with root privileges on servers running vulnerable
software.
Samba is an SMB networking protocol re-implementation that provides file sharing
and printing services across many platforms, allowing Linux, Windows, and macOS
users to share files over a network.
The vulnerability, tracked as CVE-2021-44142 and reported by Orange Tsai of
DEVCORE, is an out-of-bounds heap read/write present in the vfs_fruit VFS module
when parsing EA metadata when opening files in smbd.
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"The problem in vfs_fruit exists in the default configuration of the fruit VFS
module using fruit:metadata=netatalk or fruit:resource=file," Samba explained in
a security advisory published today.
"If both options are set to different settings than the default values, the
system is not affected by the security issue."
The vulnerable vfs_fruit module is designed to provide enhanced
compatibility with Apple SMB clients and Netatalk 3 AFP fileservers.
According to the CERT Coordination Center (CERT/CC), the list of platforms
impacted by this vulnerability includes Red Hat, SUSE Linux, and Ubuntu.
HOW TO FIX THE PROBLEM
Attackers can exploit the flaw in low complexity attacks without requiring user
interaction if the targeted servers run any Samba installations before version
4.13.17, the release that addresses this bug.
While default configurations are exposed to attacks, threat actors that would
want to target this vulnerability would need write access to a file's extended
attributes.
"Note that this could be a guest or unauthenticated user if such users are
allowed write access to file extended attributes," the Samba Team added.
Administrators are advised to install the 4.13.17, 4.14.12, and 4.15.5 releases
published today or apply the corresponding patches to correct the security
defect as soon as possible.
Samba also provides a workaround for admins who cannot immediately install the
latest releases, which requires them to remove 'fruit' from 'vfs objects' lines
in their Samba configuration files.
However, as the Samba Team notes, "changing the VFS module settings
fruit:metadata or fruit:resource to use the unaffected setting causes all stored
information to be inaccessible and will make it appear to macOS clients as if
the information is lost."
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SERGIU GATLAN
Sergiu Gatlan is a reporter who covered cybersecurity, technology, Apple,
Google, and a few other topics at Softpedia for more than a decade. Email or
Twitter DMs for tips.
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COMMENTS
* JOHNOSEY45 - 20 HOURS AGO
*
*
At this point these exploits seem intentional, linger for years, and
automated tools makes everything hands off plug and play. Seems also security
officers are chomping at the bit to overhype exploits you need physical,
admin or root credentials. No crap if you have admin you can do anything,
including steal data.
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