Use-after-free - CVE-2016-9401

Vulnerability identifier: #VU33511

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2016-9401

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local authenticated user to perform a denial of service (DoS) attack.

popd in bash might allow local users to bypass the restricted shell and cause a use-after-free via a crafted address.

Amazon Linux AMI
Gentoo Linux
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
FlashSystem 840 9840-AE1 & 9843-AE1
FlashSystem 900 9840-AE2 and 9843-AE2
PowerScale OneFS
bash (Alpine package)
bash (Red Hat package)

Install update from vendor's website.

bash (Alpine package) - update to 4.3.33-r2
PowerScale OneFS - addressed in versions 9.1.0.21, 9.2.1.14, 9.3.0.7, 9.4.0.4
bash (Red Hat package) - update to 4.1.2-48.el6

• http://rhn.redhat.com/errata/RHSA-2017-0725.html
• http://www.openwall.com/lists/oss-security/2016/11/17/5
• http://www.openwall.com/lists/oss-security/2016/11/17/9
• http://www.securityfocus.com/bid/94398
• https://access.redhat.com/errata/RHSA-2017:1931
• https://lists.debian.org/debian-lts-announce/2019/03/msg00028.html
• https://security.gentoo.org/glsa/201701-02

• Use-after-free in bash (Alpine package)
• Amazon Linux AMI update for bash
• Gentoo update for Bash
• Multiple vulnerabilities in Dell PowerScale OneFS
• Multiple vulnerabilities in IBM FlashSystem models 840 and 900
• Red Hat Enterprise Linux 6 update for bash