Cros secrets may be disclosed to untrusted relay

published 2023-09-20 3 y ago modified 2026-09-10 1 mo ago also GHSA-hp56-xvf4-g6wr , GO-2023-2072 , EUVD-2023-2524

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 55%
public exploits: 0; none known

An issue was discovered in Croc through 9.6.5. When a custom shared secret is used, the sender and receiver may divulge parts of this secret to an untrusted Relay, as part of composing a room name.

Patch / fix

fixed in 1 distros 1 links 2

go github.com/schollz/croc/v9 9.6.16

croc Alpine 3.24, Alpine 3.23, Alpine 3.22 10.0.11-r0

alpine advisories ALPINE-CVE-2023-43617

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

github.com/schollz/croc@0f1ca43 commit
github.com/schollz/croc#699 pull request

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-43617 updated 2025-11-21 cvss 2.6

croc: user may divulge parts of custom shared secret to an untrusted Relay

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-09-24)

Exploit prediction

0.77% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

openwall.com https://www.openwall.com/lists/oss-security/2023/09/08/2 referenced PoC, tagged "exploit" by a source, unverified
github.com https://github.com/schollz/croc/issues/596 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/schollz/croc/v9	<9.6.16	9.6.16
go	github.com/schollz/croc	all versions	no fix listed
go	github.com/schollz/croc/v6	all versions	no fix listed
go	github.com/schollz/croc/v8	all versions	no fix listed

Classification

Weakness

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

github.com /schollz/croc/pull/699
web, patch
github.com /schollz/croc/commit/0f1ca436cd8e608738da0b23bf594537cfbe6213
web, patch
openwall.com /lists/oss-security/2023/09/08/2
web, exploit, mailing-list, third-party-advisory
github.com /schollz/croc/issues/596
web, exploit, issue-tracking, third-party-advisory, report
openwall.com /lists/oss-security/2023/09/21/5
mailing-list, web
nvd.nist.gov /vuln/detail/CVE-2023-43617
advisory
github.com /schollz/croc
package
github.com /advisories/GHSA-hp56-xvf4-g6wr
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary