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Fencer Intel
high 7.5

GHSA-fh2r-99q2-6mmg json

rustls-webpki: CPU denial of service in certificate path building

published 3y ago modified 2mo ago also RUSTSEC-2023-0053

cvss
7.5
version 3.0, GitHub
cisa kev
Not listed
not in CISA's catalog
epss
—
no score, EPSS covers CVEs only
public exploits
0
none known

Summary

When this crate is given a pathological certificate chain to validate, it will spend CPU time exponential with the number of candidate certificates at each step of path building.

Both TLS clients and TLS servers that accept client certificate are affected.

We now give each path building operation a budget of 100 signature verifications.

The original `webpki` crate is also affected, see [GHSA-8qv2-5vq6-g2g7](https://github.com/advisories/GHSA-8qv2-5vq6-g2g7).

This was previously reported in the original crate <https://github.com/briansmith/webpki/issues/69> and re-reported to us recently.

Patch / fix

  • crates.io rustls-webpki 0.100.2, 0.101.4

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CVSS scores

assigned by version score vector
GitHub 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
OSV 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
crates.io rustls-webpki
<0.100.2
>=0.101.0, <0.101.4
>=0.0.0-0, <0.100.2
0.100.2
0.101.4

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.