PT-2021-21735 · Meow Hash · Meow Hash

Peter Schmidt-Nielsen · Published 2021-07-28 · Updated 2023-08-08 · CVE-2021-37606

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Name of the Vulnerable Software and Affected Versions Meow hash version 0.5/calico

Description The issue concerns a weakness in Meow hash 0.5/calico that allows an attacker to recover keys by querying whether there's a collision in the bottom bits of the hashes of two messages. This is demonstrated through an attack on a long-running web service, where the attacker can infer collisions by measuring timing differences.

Recommendations For Meow hash version 0.5/calico, at the moment, there is no information about a newer version that contains a fix for this vulnerability.

Side Channel Attack

Inadequate Encryption Strength

Weakness Enumeration

CWE-203

CWE-326

Related Identifiers

CVE-2021-37606

Affected Products

Meow Hash

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2021-37606 · Security Note
• https://osv.dev/vulnerability/CVE-2021-37606 · Vendor Advisory
• https://t.me/cibsecurity/26617 · Telegram Post
• https://news.ycombinator.com/item?id=27978878 · Note
• https://peter.website/meow-hash-cryptanalysis · Note