Linux Kernel fs/f2fs/super.c Divide-By-Zero Vulnerability [CVE-2018-13100]
CVE Number – CVE-2018-13100
A vulnerability in the Linux Kernel could allow a local attacker to cause a denial of service (DoS) condition on a targeted system.
The vulnerability is due to improper validation of secs_per_zone information in a corrupted Flash-Friendly File System (F2FS) image by the affected software. An attacker could exploit this vulnerability by mounting a crafted F2FS image on a targeted system. A successful exploit could trigger a divide-by-zero condition in the reset_curseg() function, as defined in the fs/f2fs/super.csource code file, causing the affected software to crash and resulting in a DoS condition.
Proof-of-concept (PoC) code that demonstrates an exploit of this vulnerability is publicly available.
Kernel.org has confirmed the vulnerability and released software updates.
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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.
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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.
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Kernel.org has released a bug report at the following link: Bug 200183
Further information here
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.