Double Free in Dropbear - CVE-2017-9078
Published: September 21, 2018
Vulnerability identifier: #VU14820
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-9078
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a double free in cleanup of TCP listeners when the -a option is enabled. The vulnerability allows a remote authenticated attacker to trigger double free error and execute arbitrary code on the target system with root privileges.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Dropbear
Fedora
dropbear (Alpine package)
dropbear (Debian package)
dropbear
Fedora
dropbear (Alpine package)
dropbear (Debian package)
dropbear
How to mitigate CVE-2017-9078
Install update from vendor's website.
Dropbear - update to 2017.75
dropbear (Alpine package) - update to 2017.75-r0
dropbear (Debian package) - update to 2014.65-1+deb8u2
dropbear - addressed in versions 2017.75-1.el6, 2017.75-1.el7, 2017.75-1.fc24, 2017.75-1.fc25, 2017.75-1.fc26
dropbear (Alpine package) - update to 2017.75-r0
dropbear (Debian package) - update to 2014.65-1+deb8u2
dropbear - addressed in versions 2017.75-1.el6, 2017.75-1.el7, 2017.75-1.fc24, 2017.75-1.fc25, 2017.75-1.fc26