CVE-2016-2568
published 2017-02-13CVE-2016-2568: pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the…
PriorityP433high7.8CVSS 3.1
AVLACHPRLUINSCCHIHAH
EPSS
0.35%
27.0th percentile
pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | policykit-1 | < policykit-1 123-1 (forky) | policykit-1 123-1 (forky) |
| msrc | azl3_polkit_123-1_on_azure_linux_3.0 | — | — |
| msrc | cbl2_polkit_0.119-3_on_cbl_mariner_2.0 | — | — |
| msrc | cm1_polkit_0.116-7_on_cbl_mariner_1.0 | — | — |
| redhat | enterprise_linux | — | — |
| redhat | enterprise_linux | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
nvdv2.04.4MEDIUMAV:L/AC:M/Au:N/C:P/I:P/A:P
osv7.8HIGH
vendor_debian7.8LOW
vendor_msrc7.8HIGH
vendor_redhat7.8HIGH
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GHSA
GHSA-8vgc-x7hv-3g84: pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to
ghsa_unreviewed·2022-05-13
CVE-2016-2568 [HIGH] CWE-116 GHSA-8vgc-x7hv-3g84: pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to
pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
OSV
CVE-2016-2568: pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to
osv·2017-02-13·CVSS 7.8
CVE-2016-2568 [HIGH] CVE-2016-2568: pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to
pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
Microsoft
pkexec, when used with --user nonpriv, allows local users to escape to the parent session
vendor_msrc·2017-02-21·CVSS 7.8
CVE-2016-2568 [HIGH] CWE-116 pkexec, when used with --user nonpriv, allows local users to escape to the parent session
pkexec, when used with --user nonpriv, allows local users to escape to the parent session
FAQ: Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Mariner: Mariner
mitre: mitre
Customer Action Required: Yes
Remediation: CBL-Mariner
Red Hat
polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl
vendor_redhat·2016-01-19·CVSS 7.8
CVE-2016-2568 [HIGH] CWE-270 polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl
polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl
pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
It was found that pkexec was vulnerable to TIOCSTI ioctl attacks, allowing the executed program to push characters to its TTY's input buffer. While being executed as a non-privileged user, a specially crafted program could force its parent TTY to enter commands, interpreted by the shell when pkexec exits.
Statement: This issue affects the versions of polkit as shipped with Red Hat Enterprise Linux 6 and 7. Red Hat Product Security has rated this issue as having Moderate security impact. A future update may addres
Debian
CVE-2016-2568: policykit-1 - pkexec, when used with --user nonpriv, allows local users to escape to the paren...
vendor_debian·2016·CVSS 7.8
CVE-2016-2568 [HIGH] CVE-2016-2568: policykit-1 - pkexec, when used with --user nonpriv, allows local users to escape to the paren...
pkexec, when used with --user nonpriv, allows local users to escape to the parent session via a crafted TIOCSTI ioctl call, which pushes characters to the terminal's input buffer.
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 123-1)
sid: resolved (fixed in 123-1)
trixie: resolved (fixed in 123-1)
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2016-2781 coreutils: Non-privileged session can escape to the parent session in chroot
bugzilla·2016-02-29·CVSS 7.8
CVE-2016-2781 [HIGH] CVE-2016-2781 coreutils: Non-privileged session can escape to the parent session in chroot
CVE-2016-2781 coreutils: Non-privileged session can escape to the parent session in chroot
It was found that When executing a program via "chroot --userspec=someuser:somegroup / /path/to/test" the nonpriv session can escape to the parent session by using the TIOCSTI ioctl to push characters into the terminal's input buffer.
CVE assignment:
http://seclists.org/oss-sec/2016/q1/452
Discussion:
Created util-linux tracking bugs for this issue:
Affects: fedora-all [bug 1312864]
---
Is that really against coreutils? Based on http://marc.info/?l=util-linux-ng&m=145694736107128&w=2 (and https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=815922 ) it seems to be issue with runuser/su - therefore util-linux was IMHO correct.
---
(In reply to Ondrej Vasik from comment #4)
> Is that really agai
Bugzilla
CVE-2016-2568 polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl
bugzilla·2016-01-21·CVSS 7.8
CVE-2016-2568 [HIGH] CVE-2016-2568 polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl
CVE-2016-2568 polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl
It was reported that when executing a program via "pkexec --user nonpriv program", the nonpriv session can escape to the parent session by using the TIOCSTI ioctl to push characters into the terminal's input buffer, allowing privilege escalation.
Original bug report (contains reproducer):
https://bugzilla.redhat.com/show_bug.cgi?id=1299955
Discussion:
Created polkit tracking bugs for this issue:
Affects: fedora-all [bug 1300747]
---
I'd like to request a CVE for this issue, thanks.
---
CVE assignment:
http://seclists.org/oss-sec/2016/q1/443
---
Statement:
This issue affects the versions of polkit as shipped with Red Hat Enterprise Linux 6 and 7. Red Hat Product Sec
Bugzilla
CVE-2016-2568 polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl [fedora-all]
bugzilla·2016-01-21·CVSS 7.8
CVE-2016-2568 [HIGH] CVE-2016-2568 polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl [fedora-all]
CVE-2016-2568 polkit: Program run via pkexec as unprivileged user can escape to parent session via TIOCSTI ioctl [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of Fedora.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: th
http://www.openwall.com/lists/oss-security/2016/02/26/3https://access.redhat.com/security/cve/cve-2016-2568https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=816062https://bugzilla.redhat.com/show_bug.cgi?id=1300746https://ubuntu.com/security/CVE-2016-2568http://www.openwall.com/lists/oss-security/2016/02/26/3https://access.redhat.com/security/cve/cve-2016-2568https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=816062https://bugzilla.redhat.com/show_bug.cgi?id=1300746https://ubuntu.com/security/CVE-2016-2568
2017-02-13
Published