TI-2023-15967 Aliases CVE-2023-32691 GHSA-qjrq-hm79-49ww

ginuerzh/gost vulnerable to Timing Attack

MEDIUM 60CWE-203Published 2023-05-30 · Updated 2025-01-10

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Impact type: Information disclosure
Confidentiality · integrity · availability: High · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-203.

Summary

gost (GO Simple Tunnel) is a simple tunnel written in golang. Sensitive secrets such as passwords, token and API keys should be compared only using a constant-time comparison function. Untrusted input, sourced from a HTTP header, is compared directly with a secret. Since this comparison is not secure, an attacker can mount a side-channel timing attack to guess the password. As a workaround, this can be easily fixed using a constant time comparing function such as `crypto/subtle`'s `ConstantTimeCompare`.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00574 47th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ginuerzh	gost	up to 2.11.5	—	No fix listed	CNA
—	github.com/ginuerzh/gost (Go)	up to 2.11.5	—	No fix listed	GHSA-qjrq-hm79-49ww

gost Vendorginuerzh Affected up to 2.11.5 Fixed in — No fix listed CNA
github.com/ginuerzh/gost (Go) Vendor— Affected up to 2.11.5 Fixed in — No fix listed GHSA-qjrq-hm79-49ww

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:go_simple_tunnel_project:go_simple_tunnel::::::go::*	up to 2.11.5	Vulnerable	Go Simple Tunnel Project

cpe:2.3:a:go_simple_tunnel_project:go_simple_tunnel:*:*:*:*:*:go:*:* Versions up to 2.11.5 Vulnerable ·Go Simple Tunnel Project

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2023-32691
2026-10-03 Alias added: GHSA-qjrq-hm79-49ww

References

Exploit 1

https://github.com/ginuerzh/gost/security/advisories/GHSA-qjrq-hm79-49ww

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2023-32691

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences