SB2018042616 - Link following in Debian Linux
Published: April 26, 2018 Updated: August 8, 2020
Security Bulletin ID
SB2018042616
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Link following (CVE-ID: CVE-2016-9602)
CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
The vulnerability allows a remote authenticated user to execute arbitrary code.
Qemu before version 2.9 is vulnerable to an improper link following when built with the VirtFS. A privileged user inside guest could use this flaw to access host file system beyond the shared folder and potentially escalating their privileges on a host.
Remediation
Install update from vendor's website.
References
- http://www.openwall.com/lists/oss-security/2017/01/17/12
- http://www.securityfocus.com/bid/95461
- http://www.securitytracker.com/id/1037604
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9602
- https://lists.debian.org/debian-lts-announce/2018/09/msg00007.html
- https://lists.gnu.org/archive/html/qemu-devel/2017-01/msg06225.html
- https://lists.gnu.org/archive/html/qemu-devel/2017-02/msg04347.html
- https://security.gentoo.org/glsa/201704-01