Snapd seccomp filter TIOCSTI ioctl bypass
CVE-2019-7303

5.7MEDIUM

Key Information:

Vendor
Canonical
Status
Snapd
Vendor
CVE Published:
21 March 2019

Summary

A vulnerability in the seccomp filters of Canonical snapd before version 2.37.4 allows a strict mode snap to insert characters into a terminal on a 64-bit host. The seccomp rules were generated to match 64-bit ioctl(2) commands on a 64-bit platform; however, the Linux kernel only uses the lower 32 bits to determine which ioctl(2) commands to run. This issue affects: Canonical snapd versions prior to 2.37.4.

Affected Version(s)

snapd < 2.37.4

References

https://usn.ubuntu.com/3917-1/
x_refsource_MISC
https://www.exploit-db.com/exploits/46594
x_refsource_MISC

CVSS V3.1

Score:
5.7
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jann Horn
.