Bug 1418825 - Memory leak allows shaping the heap in pkexec.c
Summary: Memory leak allows shaping the heap in pkexec.c
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: polkit
Version: 7.3
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: rc
: ---
Assignee: Polkit Maintainers
QA Contact: qe-baseos-daemons
URL:
Whiteboard:
Depends On: 1418824
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-02-02 20:00 UTC by Leonard den Ottolander
Modified: 2021-01-15 07:31 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1418824
Environment:
Last Closed: 2021-01-15 07:31:21 UTC
Target Upstream Version:


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Description Leonard den Ottolander 2017-02-02 20:00:10 UTC
+++ This bug was initially created as a clone of Bug #1418824 +++

In polkit-112-9.el7 pkexec.c is a memory leak that can be used to "spray the heap". Compare https://googleprojectzero.blogspot.nl/2014/08/the-poisoned-nul-byte-2014-edition.html "Step 5: Aha! use a command-line argument spray to effect a heap spray and collide the heap into the stack". The article describes an effective attack using this ability to "heap spray".

This issue has been fixed upstream by disallowing multiple user invocations:

https://cgit.freedesktop.org/polkit/commit/src/programs/pkexec.c?id=6c992bc8aefa195a41eaa41c07f46f17de18e25c

Similar issues exist in pkcheck.c but since that binary is not setuid the memory leaks in that binary are not quite as acute. Compare bug #1418278 & bug #1418287 .

Comment 4 RHEL Program Management 2021-01-15 07:31:21 UTC
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.


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