CVE-2025-24903 libsignal-service-rs Doesn't Check Origin of Sync Messages
Attackers can forge sync messages to impersonate other devices, requiring library updates to enforce origin checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-24903?
CVE-2025-24903 is a high-severity missing authorization vulnerability in whisperfish libsignal-service-rs, published on 13 Feb 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
libsignal-service-rs is a Rust version of the libsignal-service-java library which implements the core functionality to communicate with Signal servers. Prior to commit 82d70f6720e762898f34ae76b0894b0297d9b2f8, any contact may forge a sync message, impersonating another device of the local user. The origin of sync messages is not checked. Patched libsignal-service can be found after commit 82d70f6720e762898f34ae76b0894b0297d9b2f8. The `Metadata` struct contains an additional `was_encrypted` field, which breaks the API, but should be easily resolvable. No known workarounds are available.
Weakness: CWE-345
Which versions are affected by CVE-2025-24903?
How do I fix CVE-2025-24903?
No fix has been published for CVE-2025-24903 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-24903 being exploited?
There is no known exploitation of CVE-2025-24903 in the wild and no public exploit code.
Sources
Also known as GHSA-r58q-66g9-h6g8.