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FORTINET ADDRESSES UNPATCHED CRITICAL RCE VECTORFORTINET ADDRESSES UNPATCHED
CRITICAL RCE VECTOR

Fortinet has patched CVE-2023-34990 in its Wireless LAN Manager (FortiWLM),
which combined with CVE-2023-48782 could allow for unauthenticated remote code
execution (RCE) and the ability to read all log files.

Tara Seals, Managing Editor, News, Dark Reading

December 19, 2024

2 Min Read
Source: Konstantin Nechaev via Alamy Stock Photo


NEWS BRIEF

Fortinet has finally patched a critical security vulnerability in its Wireless
LAN Manager (FortiWLM) that could allow unauthenticated sensitive information
disclosure. And, when chained with another issue, it could lead to remote code
execution (RCE), a researcher warned.

The bug (CVE-2023-34990, CVSS 9.6) was first disclosed in March, when it was
described as an "unauthenticated limited file read vulnerability" without a CVE.

"This issue results from the lack of input validation on request parameters
allowing an attacker to traverse directories and read any log file on the
system," Horizon3.ai security researcher Zach Hanley, who reported the bug to
Fortinet, noted in March. He has confirmed to Dark Reading that the bug patched
this week is the same issue.

He added, "Luckily for an attacker, the FortiWLM has very verbose logs — and
logs the session ID of all authenticated users. Abusing the above arbitrary log
file read, an attacker can now obtain the session ID of a user and login and
also abuse authenticated endpoints."



NIST's National Vulnerability Database (NVD) has noted that the flaw can also be
used to "execute unauthorized code or commands via specially crafted Web
requests" — thanks to the access it provides to those authenticated endpoints.

The bug affects FortiWLM versions 8.6.0 through 8.6.5 (fixed in 8.6.6 or above)
and versions 8.5.0 through 8.5.4 (fixed in 8.5.5 or above).


COMBINING FORTINET VULNERABILITIES TO ACHIEVE RCE

Hanley back in March flagged a potential exploit chain as well: When
CVE-2023-34990 is combined with an authenticated command-injection bug that
Fortinet patched last year (CVE-2023-48782, CVSS 8.8), it becomes another recipe
for RCE.

This second issue allows an attacker who has used CVE-2023-34990 to gain access
to an authenticated endpoint to, from there, inject a crafted malicious string
in a request to the /ems/cgi-bin/ezrf_switches.cgi endpoint that will be
executed with root privileges.

"Combining both the unauthenticated arbitrary log file read and this
authenticated command injection, an unauthenticated attacker can obtain remote
code execution in the context of root," Hanley explained. "This endpoint is
accessible for both low privilege users and admins."

Admins should patch the Fortinet appliances ASAP, given the vendor's status as a
most-favored cyberattack target.

Read more about:

News Briefs



ABOUT THE AUTHOR

Tara Seals, Managing Editor, News, Dark Reading



Tara Seals has 20+ years of experience as a journalist, analyst and editor in
the cybersecurity, communications and technology space. Prior to Dark Reading,
Tara was Editor in Chief at Threatpost, and prior to that, the North American
news lead for Infosecurity Magazine. She also spent 13 years working for Informa
(formerly Virgo Publishing), as executive editor and editor-in-chief at
publications focused on both the service provider and the enterprise arenas. A
Texas native, she holds a B.A. from Columbia University, lives in Western
Massachusetts with her family and is on a never-ending quest for good Mexican
food in the Northeast.


See more from Tara Seals, Managing Editor, News, Dark Reading
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