Exploitation Summary
EIP tracks 1 public exploit for CVE-2023-29409. PoCs published by mateusz834.
AI-analyzed exploit summary This PoC demonstrates a CPU exhaustion vulnerability in Go's TLS implementation (CVE-2023-29409) by using a maliciously crafted RSA key with a large modulus during TLS handshakes. The exploit triggers high CPU usage on both client and server sides due to inefficient signature verification.
Description
Extremely large RSA keys in certificate chains can cause a client/server to expend significant CPU time verifying signatures. With fix, the size of RSA keys transmitted during handshakes is restricted to <= 8192 bits. Based on a survey of publicly trusted RSA keys, there are currently only three certificates in circulation with keys larger than this, and all three appear to be test certificates that are not actively deployed. It is possible there are larger keys in use in private PKIs, but we target the web PKI, so causing breakage here in the interests of increasing the default safety of users of crypto/tls seems reasonable.
Exploits (1)
This PoC demonstrates a CPU exhaustion vulnerability in Go's TLS implementation (CVE-2023-29409) by using a maliciously crafted RSA key with a large modulus during TLS handshakes. The exploit triggers high CPU usage on both client and server sides due to inefficient signature verification.
References (6)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L