SB2025112755 - Use of insufficiently random values in Ribose RNP
Published: November 27, 2025
Security Bulletin ID
SB2025112755
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Use of insufficiently random values (CVE-ID: CVE-2025-13470)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to the symmetric session key used for Public-Key Encrypted Session Key (PKESK) packets is left uninitialized except for zeroing, resulting in it always being an all-zero byte array. As a result any data encrypted using public-key encryption in this release can be decrypted trivially by supplying an all-zero session key, fully compromising confidentiality.
Remediation
Install update from vendor's website.
References
- https://access.redhat.com/security/cve/cve-2025-13402
- https://aur.archlinux.org/packages/rnp
- https://bugzilla.redhat.com/show_bug.cgi?id=2415863
- https://github.com/rnpgp/rnp/commit/7bd9a8dc356aae756b40755be76d36205b6b161a
- https://github.com/rnpgp/rnp/releases/tag/v0.18.1
- https://launchpad.net/ubuntu/+source/rnp
- https://open.ribose.com/advisories/ra-2025-11-20/
- https://packages.gentoo.org/packages/dev-util/librnp