Bug 1699856 (CVE-2019-11190) - CVE-2019-11190 kernel: ASLR bypass for setuid binaries due to late install_exec_creds()
Summary: CVE-2019-11190 kernel: ASLR bypass for setuid binaries due to late install_ex...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-11190
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1700360 1700361 1700362 2117200
Blocks: 1696601
TreeView+ depends on / blocked
 
Reported: 2019-04-15 11:53 UTC by Vladis Dronov
Modified: 2022-08-10 10:01 UTC (History)
19 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw in the load_elf_binary() function in the Linux kernel allows a local attacker to leak the base address of .text and stack sections for setuid binaries and bypass ASLR because install_exec_creds() is called too late in this function.
Clone Of:
Environment:
Last Closed: 2020-03-31 22:33:52 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:1016 0 None None None 2020-03-31 19:11:29 UTC
Red Hat Product Errata RHSA-2020:1070 0 None None None 2020-03-31 19:20:30 UTC

Description Vladis Dronov 2019-04-15 11:53:32 UTC 
A flaw in the load_elf_binary() function in the Linux kernel allows a local attacker to leak the base address of .text and stack sections for setuid binaries and thus to bypass ASLR because install_exec_creds() is called too late in this function.

References:

https://seclists.org/oss-sec/2019/q2/9

https://www.openwall.com/lists/oss-security/2019/04/03/4

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9f834ec18defc369d73ccf9e87a2790bfa05bf46
Comment 3 Vladis Dronov 2019-04-16 11:39:55 UTC 
Notes:

In our research we was not able to reproduce the issue with the standard RHEL-7 kernel, but only with modified kernel with specially inserted delay, which widens a race window. This means the race condition still exists, i.e. the system is still vulnerable, but it is hard to hit it.
Comment 5 errata-xmlrpc 2020-03-31 19:11:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1016 https://access.redhat.com/errata/RHSA-2020:1016
Comment 6 errata-xmlrpc 2020-03-31 19:20:25 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:1070 https://access.redhat.com/errata/RHSA-2020:1070
Comment 7 Product Security DevOps Team 2020-03-31 22:33:52 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-11190
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