CVE-2023-6193: Unbounded queuing of path validation messages in cloudflare-quiche
First published: Tue Dec 12 2023(Updated: )
### Impact quiche v. 0.15.0 through 0.19.0 was discovered to be vulnerable to unbounded queuing of path validation messages, which could lead to excessive resource consumption. QUIC path validation ([RFC 9000 Section 8.2](https://datatracker.ietf.org/doc/html/rfc9000#section-8.2)) requires that the recipient of a PATH_CHALLENGE frame responds by sending a PATH_RESPONSE. An unauthenticated remote attacker can exploit the vulnerability by sending PATH_CHALLENGE frames and manipulating the connection (e.g. by restricting the peer's congestion window size) so that PATH_RESPONSE frames can only be sent at the slower rate than they are received, leading to storage of path validation data in an unbounded queue. ### Patches Quiche versions greater than 0.19.0 address this problem. ### References [CVE-2023-6193](https://www.cve.org/CVERecord?id=CVE-2023-6193) [RFC 9000 Section 8.2](https://datatracker.ietf.org/doc/html/rfc9000#section-8.2)
Credit: cna@cloudflare.com cna@cloudflare.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| rust/quiche | >=0.15.0<0.19.1 | 0.19.1 |
| Cloudflare Quiche | >=0.15.0<=0.19.0 |
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Reference Links
- https://github.com/cloudflare/quiche/security/advisories/GHSA-w3vp-jw9m-f9pm
- https://nvd.nist.gov/vuln/detail/CVE-2023-6193
- https://github.com/cloudflare/quiche/commit/ea7ecf39ae28ab24cf1785c1674dc2e8a076f9ca
- https://datatracker.ietf.org/doc/html/rfc9000#section-8.2
- https://github.com/advisories/GHSA-w3vp-jw9m-f9pm (Advisory)
Frequently Asked Questions
What is the severity of CVE-2023-6193?
CVE-2023-6193 has a high severity due to its potential to cause excessive resource consumption.
How do I fix CVE-2023-6193?
To fix CVE-2023-6193, upgrade quiche to version 0.19.1 or later.
What versions are affected by CVE-2023-6193?
CVE-2023-6193 affects quiche versions 0.15.0 through 0.19.0.
What kind of vulnerability is CVE-2023-6193?
CVE-2023-6193 is a vulnerability related to unbounded queuing of path validation messages.
Who is impacted by CVE-2023-6193?
Users of quiche versions 0.15.0 to 0.19.0, particularly those using Cloudflare's implementation, are impacted by CVE-2023-6193.
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