GNU patch Symlinks Following Vulnerability [CVE-2019-13636]
CVE number – CVE-2019-13636
A vulnerability in GNU patch could allow a local attacker to gain unauthorized access to files or directories on a targeted system.
The vulnerability exists because the affected software mishandles the following of symlinks in certain cases other than input files and affects the inp.c and util.c source code files of the software. An attacker could exploit this vulnerability to gain unauthorized access to read or modify files and directories on a targeted system. A successful exploit could be used to conduct further attacks.
GNU has confirmed the vulnerability and released software updates.
Analysis
- To exploit this vulnerability, the attacker must have user-level access to the targeted system. This access requirement could reduce the likelihood of a successful exploit
Safeguards
- Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local systems.
Administrators are advised to allow only privileged users to access administration or management systems.
Administrators are advised to monitor critical systems.
Vendor Announcements
- GNU has released a git commit at the following link: commit dce4683cbbe107a95f1f0d45fabc304acfb5d71a
Fixed Software
- GNU has released a software patch at the following link: Don’t follow symlinks unless –follow-symlinks is given
Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.