CVE-2018-1000001

high

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

9.0

Description

In glibc 2.26 and earlier there is confusion in the usage of getcwd() by realpath() which can be used to write before the destination buffer leading to a buffer underflow and potential code execution.

Predictions

Exploit likelihood

20%

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-44889 local linux verified

Metasploit · 2018-06-13

glibc - 'realpath()' Privilege Escalation (Metasploit)

Source code queued for fetch — refresh in a moment.

EDB-43775 local linux verified

halfdog · 2018-01-16

glibc < 2.26 - 'getcwd()' Local Privilege Escalation

Source code queued for fetch — refresh in a moment.

Metasploit modules

exploit_linux/local/glibc_realpath_priv_esc rank 300

glibc 'realpath()' Privilege Escalation

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

OS impact

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`2.26-11`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`2.26-4`
sid	Fixed	`2.26-4`
forky	Fixed	`2.26-4`
bullseye	Fixed	`2.26-4`
bookworm	Fixed	`2.26-4`

References

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

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