CVE-2019-7303

unknown

Published — · Modified —

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

1.0

Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-46594 dos linux verified

Google Security Research · 2019-03-22

snap - seccomp BBlacklist for TIOCSTI can be Circumvented

Source code queued for fetch — refresh in a moment.

OS impact

OS	Version	Status	Fixed in
debian	bookworm	fixed	`2.37.4-1`
debian	bullseye	fixed	`2.37.4-1`
debian	forky	fixed	`2.37.4-1`
debian	sid	fixed	`2.37.4-1`
debian	trixie	fixed	`2.37.4-1`

References

https://security-tracker.debian.org/tracker/CVE-2019-7303

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.