Vulnerability · Published Jan 25, 2024 · Assigned by GitHub_M

CVE-2024-23656Dex 2.37.0 is discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers

High 7.5

In plain English

A high-severity security flaw in dex from dexidp. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 62.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex 2.37.0 serves HTTPS with insecure TLS 1.0 and TLS 1.1. `cmd/dex/serve.go` line 425 seemingly sets TLS 1.2 as minimum version, but the whole `tlsConfig` is ignored after `TLS cert reloader` was introduced in v2.37.0. Configured cipher suites are not respected either. This issue is fixed in Dex 2.38.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/dexidp/dex	2.38.0	GHSA-gr79-9v6v-gc9r
Go	github.com/dexidp/dex	0.0.0-20240125115555-5bbdb4420254	GHSA-gr79-9v6v-gc9r
Go	github.com/dexidp/dex	no fix listed	GO-2024-2476

Affected products (as reported)

Vendor	Product	Versions
dexidp	dex	= 2.37.0

Weakness: CWE-326, CWE-757 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

https://github.com/dexidp/dex/security/advisories/GHSA-gr79-9v6v-gc9r x_refsource_CONFIRM
https://github.com/dexidp/dex/issues/2848 x_refsource_MISC
https://github.com/dexidp/dex/pull/2964 x_refsource_MISC
https://github.com/dexidp/dex/commit/5bbdb4420254ba73b9c4df4775fe7bdacf233b17 x_refsource_MISC
https://github.com/dexidp/dex/blob/70d7a2c7c1bb2646b1a540e49616cbc39622fb83/cmd/dex/serve.go#L425 x_refsource_MISC