CVE-2020-10732

Published: 12 June 2020

A flaw was found in the Linux kernel's implementation of Userspace core dumps. This flaw allows an attacker with a local account to crash a trivial program and exfiltrate private kernel data.

From the Ubuntu Security Team

It was discovered that the elf handling code in the Linux kernel did not initialize memory before using it in certain situations. A local attacker could use this to possibly expose sensitive information (kernel memory).

Notes

original report claimed this was introduced in
4206d3aa1978e44f58bfa4e1c9d8d35cbf19c187, but further investigation
by Jann Horn makes the case that 91c3dba7dbc1 is where the real
problem is introduced.

Status

Severity score breakdown

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-10732
• https://www.openwall.com/lists/oss-security/2020/05/06/1
• https://twitter.com/grsecurity/status/1252558055629299712
• https://lore.kernel.org/lkml/CAG48ez1u9=Uqcx2dH=7xea1R+WpnL239DSoVHLwV09=FxZUevQ@mail.gmail.com/#t
• https://ubuntu.com/security/notices/USN-4411-1
• https://ubuntu.com/security/notices/USN-4427-1
• https://ubuntu.com/security/notices/USN-4439-1
• https://ubuntu.com/security/notices/USN-4440-1
• https://ubuntu.com/security/notices/USN-4485-1
• NVD
• Launchpad
• Debian

Bugs

• https://github.com/google/kmsan/issues/76