Use After Free in GNU Bash
CVE-2016-9401
popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted address.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (34.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 34.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- GNU Bash — versions 4.4
- Debian Linux — versions 8.0
- Red Hat Enterprise Linux Desktop — versions 6.0, 7.0
- Red Hat Enterprise Linux Server — versions 6.0, 7.0
- Red Hat Enterprise Linux Server Aus — versions 7.4, 7.6, 7.7
- Red Hat Enterprise Linux Server Eus — versions 7.4, 7.5, 7.6
- Red Hat Enterprise Linux Server Tus — versions 7.6, 7.7
- Red Hat Enterprise Linux Workstation — versions 6.0, 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- rhn.redhat.com/errata/RHSA-2017-0725.html (vendor-advisory, Third Party Advisory)
- access.redhat.com/errata/RHSA-2017:1931 (vendor-advisory, Third Party Advisory)
- www.openwall.com/lists/oss-security/2016/11/17/5 (mailing-list, Mailing List, Third Party Advisory)
- www.openwall.com/lists/oss-security/2016/11/17/9 (mailing-list, Mailing List, Third Party Advisory)
- www.securityfocus.com/bid/94398 (VDB Entry, Third Party Advisory, vdb-entry)
- security.gentoo.org/glsa/201701-02 (vendor-advisory, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/03/msg00028.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2016-9401?
- CVE-2016-9401 is a medium-severity vulnerability in GNU Bash, classified under Use After Free. CVSS score: 5.5/10. Published 2017-01-23.
- How severe is CVE-2016-9401?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2016-9401 known to be exploited?
- 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.