Linux Kernel null skcipher Local Privilege Escalation Vulnerability [CVE-2018-14619]

CVE Number – CVE-2018-14619

A vulnerability in the crypto subsystem of the Linux Kernel could allow a local attacker to gain elevated privileges on a targeted system.

The vulnerability is due to an incorrect reference to the null skcipher held by each transformation object (TFM), improperly placed when each af_alg_ctx is freed from an affected device. An attacker could exploit this vulnerability by using a custom program to cause the null skcipher to be freed while it is still in use. A successful exploit could allow the attacker to gain elevated privileges on an affected device.

Kernel.org 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 may reduce the likelihood of a successful exploit.
Safeguards
  • Administrators are advised to apply the appropriate updates.

    Administrators are advised to allow only privileged users to access administration or management systems.

    Administrators are advised to monitor affected systems.

    Administrators are advised to allow only trusted users to access local systems.

Vendor Announcements
Fixed Software




Duncan Newell

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.

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