Bug 2226784 (CVE-2023-39192, ZDI-CAN-18408) - CVE-2023-39192 kernel: netfilter: xtables out-of-bounds read in u32_match_it()
Summary: CVE-2023-39192 kernel: netfilter: xtables out-of-bounds read in u32_match_it()
Keywords:
Status: NEW
Alias: CVE-2023-39192, ZDI-CAN-18408
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Nobody
QA Contact:
URL:
Whiteboard:
Depends On: 2227293 2227294 2227295 2227296 2242876
Blocks: 2225771
TreeView+ depends on / blocked
 
Reported: 2023-07-26 14:13 UTC by Mauro Matteo Cascella
Modified: 2024-05-22 09:51 UTC (History)
52 users (show)

Fixed In Version: kernel 6.6-rc1
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in the Netfilter subsystem in the Linux kernel. The xt_u32 module did not validate the fields in the xt_u32 structure. This flaw allows a local privileged attacker to trigger an out-of-bounds read by setting the size fields with a value beyond the array boundaries, leading to a crash or information disclosure.
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2024:2950 0 None None None 2024-05-22 09:14:18 UTC
Red Hat Product Errata RHSA-2024:3138 0 None None None 2024-05-22 09:51:14 UTC

Description Mauro Matteo Cascella 2023-07-26 14:13:58 UTC 
An out-of-bounds read issue was found in the Linux kernel in the u32_match_it() function, which is used to match packet content under netfilter. This flaw requires CAP_NET_ADMIN to be exploited and could lead to information disclosure.
Comment 10 Mauro Matteo Cascella 2023-10-09 07:41:11 UTC 
ZDI security advisory:
https://www.zerodayinitiative.com/advisories/ZDI-CAN-18408/

Upstream fix:
https://github.com/torvalds/linux/commit/69c5d284f67089b4750d28ff6ac6f52ec224b330
Comment 11 Mauro Matteo Cascella 2023-10-09 14:39:32 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2242876]
Comment 12 Justin M. Forbes 2023-10-12 16:34:32 UTC 
This was fixed for Fedora with the 6.5.3 stable kernels.
Comment 13 errata-xmlrpc 2024-05-22 09:14:13 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:2950 https://access.redhat.com/errata/RHSA-2024:2950
Comment 14 errata-xmlrpc 2024-05-22 09:51:10 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2024:3138 https://access.redhat.com/errata/RHSA-2024:3138
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