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Bug 2096457 - Faulty handling of static applications
Summary: Faulty handling of static applications
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: fapolicyd
Version: 9.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Radovan Sroka
QA Contact: Dalibor Pospíšil
URL:
Whiteboard:
Depends On: 2084497
Blocks: 2097734 2127866
TreeView+ depends on / blocked
 
Reported: 2022-06-13 21:46 UTC by Dalibor Pospíšil
Modified: 2022-11-15 11:47 UTC (History)
3 users (show)

Fixed In Version: fapolicyd-1.1-101.el9
Doc Type: No Doc Update
Doc Text:
Clone Of: 2084497
: 2097734 2127866 (view as bug list)
Environment:
Last Closed: 2022-11-15 10:41:03 UTC
Type: Bug
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-125163 0 None None None 2022-06-13 21:47:41 UTC
Red Hat Issue Tracker SECENGSP-4633 0 None None None 2022-06-13 21:47:51 UTC
Red Hat Product Errata RHBA-2022:8236 0 None None None 2022-11-15 10:41:18 UTC

Description Dalibor Pospíšil 2022-06-13 21:46:35 UTC
+++ This bug was initially created as a clone of Bug #2084497 +++

Fapolicyd does not appear to maintain a complete execution state machine spanning the execution of statically linked executables, and the subsequent execution of further executables by such processes. As a result, fapolicyd does not always update the exe path for a process when the process performing the execve(2)/execveat(2) syscall is statically linked. This may result in rule bypasses due to the wrong subject being applied.

Reproducer(simplified): 
- two static apps
- first one in trusted
- the first one executed the second one
- the second one should be blocked
- All of the second app’s attributes (as seen in debug mode or syslog) should match it and not it’s parent: exe, comm, pid, etc.



ACs:
* fapolicyd correctly blocks untrusted apps executed via a trusted statically linked app
* all trusted apps are allowed
* all untrusted apps are denied

Comment 16 errata-xmlrpc 2022-11-15 10:41:03 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (fapolicyd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:8236


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