coreutils: tty hijacking possible in "su" via TIOCSTI ioctl
Published Nov 4, 2019
7.8
HIGHCVSS 3.1
EPSS 0.63%
Description
There is a possible tty hijacking in shadow 4.x before 4.1.5 and sudo 1.x before 1.7.4 via "su - user -c program". The user session can be escaped to the parent session by using the TIOCSTI ioctl to push characters into the input buffer to be read by the next process.
Affected products
-
- Version 4.x before 4.1.5StatusaffectedConstraints-
- Version
-
- Version 1.x before 1.7.4StatusaffectedConstraints-
- Version
Configuration 1
- ≥ 4.0.0 · ≤ 4.1.5
- ≥ 1.3.0 · ≤ 1.7.4
Configuration 2
- 8.0
- 9.0
- 10.0
Configuration 3
- 4
- 5
- 6.0
No data.
Red Hat Enterprise Linux 4
coreutils
Will not fix
Red Hat Enterprise Linux 5
coreutils
Not affected
Red Hat Enterprise Linux 6
coreutils
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | coreutils | Will not fix | n/a |
| Red Hat Enterprise Linux 5 | coreutils | Not affected | n/a |
| Red Hat Enterprise Linux 6 | coreutils | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue affects the version of coreutils package, as shipped with Red Hat Enterprise Linux 4. Red Hat Enterprise Linux 4 is however in the Extended Life Cycle Support (ELS) phase. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.63% (0.00630) | 48.25th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.64% (0.00635) | 45.46th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.16% (0.00163) | 34.84th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.07% (0.00067) | 31.64th | v3 (v2023.03.01) |
| Jun 15, 2024 | 0.06% (0.00057) | 23.58th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00057) | 21.58th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.28% (0.01282) | 68.34th | v2 (v2022.01.01) |
| Feb 22, 2023 | 1.28% (0.01282) | 68.05th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.28% (0.01282) | 65.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.28% (0.01282) | 41.72th | v2 (v2022.01.01) |
References (15)
- http://www.openwall.com/lists/oss-security/2012/11/06/8 x_refsource_MISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2013/05/20/3 x_refsource_MISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2013/11/28/10 x_refsource_MISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2013/11/29/5 x_refsource_MISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2014/10/20/9 x_refsource_MISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2014/10/21/1 x_refsource_MISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2014/12/15/5 x_refsource_MISCMailing ListThird Party Advisory
- http://www.openwall.com/lists/oss-security/2016/02/25/6 x_refsource_MISCExploitMailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2005-4890 Vendor Advisory
- https://access.redhat.com/security/cve/cve-2005-4890 x_refsource_MISCThird Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=710208 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2005-4890 x_refsource_MISCIssue TrackingThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2005-4890
- https://security-tracker.debian.org/tracker/CVE-2005-4890 x_refsource_MISCThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2005-4890
Change history (0)
No recorded changes yet.