CVE-2023-48230

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Source
https://nvd.nist.gov/vuln/detail/CVE-2023-48230
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-48230.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2023-48230
Aliases
  • GHSA-r89h-f468-62w3
Related
Published
2023-11-21T21:15:08Z
Modified
2024-09-18T03:25:50.494883Z
Severity
  • 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
[none]
Details

Cap'n Proto is a data interchange format and capability-based RPC system. In versions 1.0 and 1.0.1, when using the KJ HTTP library with WebSocket compression enabled, a buffer underrun can be caused by a remote peer. The underrun always writes a constant value that is not attacker-controlled, likely resulting in a crash, enabling a remote denial-of-service attack. Most Cap'n Proto and KJ users are unlikely to have this functionality enabled and so unlikely to be affected. Maintainers suspect only the Cloudflare Workers Runtime is affected.

If KJ HTTP is used with WebSocket compression enabled, a malicious peer may be able to cause a buffer underrun on a heap-allocated buffer. KJ HTTP is an optional library bundled with Cap'n Proto, but is not directly used by Cap'n Proto. WebSocket compression is disabled by default. It must be enabled via a setting passed to the KJ HTTP library via HttpClientSettings or HttpServerSettings. The bytes written out-of-bounds are always a specific constant 4-byte string { 0x00, 0x00, 0xFF, 0xFF }. Because this string is not controlled by the attacker, maintainers believe it is unlikely that remote code execution is possible. However, it cannot be ruled out. This functionality first appeared in Cap'n Proto 1.0. Previous versions are not affected.

This issue is fixed in Cap'n Proto 1.0.1.1.

References

Affected packages

Debian:13 / capnproto

Package

Name
capnproto
Purl
pkg:deb/debian/capnproto?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.0.1-3

Affected versions

0.*

0.9.2-2
0.9.2-3
0.9.2-4

1.*

1.0.1-1
1.0.1-2

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Git / github.com/capnproto/capnproto

Affected ranges

Type
GIT
Repo
https://github.com/capnproto/capnproto
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
Fixed