How severe is CVE-2024-8158?

CVE-2024-8158 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2024-8158 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-8158?

CVE-2024-8158 affects 9front Lib9p. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-8158?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2024-8158 have an EU (EUVD) identifier?

Yes. CVE-2024-8158 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-48983.

When was CVE-2024-8158 published?

CVE-2024-8158 was published on 2024-08-25 and last updated on 2026-06-17.

CVE-2024-8158

CVE-2024-8158 is a medium-severity vulnerability in 9front Lib9p with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 8.8
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-48983
Weakness: CWE-639
Affected product: 9front Lib9p
Published: 2024-08-25
Last modified: 2026-06-17

Description

A bug in the 9p authentication implementation within lib9p allows an attacker with an existing valid user within the configured auth server to impersonate any other valid filesystem user. This is due to lib9p not properly verifying that the uname given in the Tauth and Tattach 9p messages matches the client UID returned from the factotum authentication handshake. The only filesystem making use of these functions within the base 9front systems is the experimental hjfs disk filesystem, other disk filesystems (cwfs and gefs) are not affected by this bug. This bug was inherited from Plan 9 and is present in all versions of 9front and is remedied fully in commit 9645ae07eb66a59015e3e118d0024790c37400da.

Frequently asked questions

What is CVE-2024-8158?: A bug in the 9p authentication implementation within lib9p allows an attacker with an existing valid user within the configured auth server to impersonate any other valid filesystem user. This is due to lib9p not properly verifying that the uname given in the Tauth and Tattach 9p messages matches the client UID returned from the factotum authentication handshake. The only filesystem making use of these functions within the base 9front systems is the experimental hjfs disk filesystem, other disk filesystems (cwfs and gefs) are not affected by this bug. This bug was inherited from Plan 9 and is present in all versions of 9front and is remedied fully in commit 9645ae07eb66a59015e3e118d0024790c37400da.
How severe is CVE-2024-8158?: CVE-2024-8158 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2024-8158 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-8158?: CVE-2024-8158 affects 9front Lib9p. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-8158?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2024-8158 have an EU (EUVD) identifier?: Yes. CVE-2024-8158 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-48983.
When was CVE-2024-8158 published?: CVE-2024-8158 was published on 2024-08-25 and last updated on 2026-06-17.

References

https://git.9front.org/plan9front/plan9front/07aa9bfeef55ca987d411115adcfbbd4390ecf34/commit.html

Affected products (1)

cpe:2.3:a:9front:lib9p:*:*:*:*:*:*:*:*

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