CVE-2021-3156

high KEV

Published 2022-04-06 · Modified 2022-04-06

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

10.0

Description

Sudo contains an off-by-one error that can result in a heap-based buffer overflow, which allows for privilege escalation.

CISA KEV

Vendor: Sudo
Product: Sudo
Due date: 2022-04-27

Predictions

Exploit likelihood

99%

Patch ETA

—

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-49521 local multiple

West Shepherd · 2021-02-03

Sudo 1.9.5p1 - 'Baron Samedit ' Heap-Based Buffer Overflow Privilege Escalation (1)

Source code queued for fetch — refresh in a moment.

EDB-49522 local multiple

nu11secur1ty · 2021-02-03

Sudo 1.9.5p1 - 'Baron Samedit ' Heap-Based Buffer Overflow Privilege Escalation (2)

Source code queued for fetch — refresh in a moment.

Metasploit modules

exploit_linux/local/sudo_baron_samedit rank 600

Sudo Heap-Based Buffer Overflow

Source fetch failed: fetch_error — view the original via the link above.

OS impact

SUSE Affected 1 release

Version	Status	Fixed in
—	Affected	—

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`1.9.5.p2-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`1.9.5p1-1.1`
sid	Fixed	`1.9.5p1-1.1`
forky	Fixed	`1.9.5p1-1.1`
bullseye	Fixed	`1.9.5p1-1.1`
bookworm	Fixed	`1.9.5p1-1.1`

Red Hat Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

References

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

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