Bug 2240527

Summary: kernel: netfilter: ipset: array Indexing error in ip_set_hash_netportnet.c
Product: [Other] Security Response Reporter: TEJ RATHI <trathi>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: CLOSED DUPLICATE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2023-09-25 06:02:56 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2240528    
Bug Blocks:    

Description TEJ RATHI 2023-09-25 05:56:50 UTC 
An array indexing vulnerability in the netfilter ipset subsystem in Linux, which can be exploited in some systems because of its nature to increment/decrement pointers out-of-bound.

The root cause of the vulnerability is a missing IP_SET_HASH_WITH_NET0 macro in `ip_set_hash_netportnet`, which leads it to use the wrong wrong `CIDR_POS(c)` macro for calulating array offsets.

This provides attackers with the primitive to arbitrarily increment/decrement a memory out-of-bound, which is likely
exploitable, attackers can manipulate a buffer pointer to obtain OOB read/write primitive; or increase the length of a buffer, to read/write out of bound.

https://seclists.org/oss-sec/2023/q3/216
https://git.kernel.org/linus/050d91c03b28ca479df13dfb02bcd2c60dd6a878
Comment 1 TEJ RATHI 2023-09-25 05:57:14 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2240528]
Comment 2 TEJ RATHI 2023-09-25 06:02:56 UTC 

*** This bug has been marked as a duplicate of bug 2239843 ***