RNP 0.18.0 Vulnerable PKESK session keys_CVE-2025-13470

7.7 / 10

HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/AU:Y/RE:H/U:Red

Description

In RNP version 0.18.0 a refactoring regression causes the symmetric
session key used for Public-Key Encrypted Session Key (PKESK) packets to
be left uninitialized except for zeroing, resulting in it always being
an all-zero byte array.

Any data encrypted using public-key encryption
in this release can be decrypted trivially by supplying an all-zero
session key, fully compromising confidentiality.

The vulnerability affects only public key encryption (PKESK packets). Passphrase-based encryption (SKESK packets) is not affected.

Root cause: Vulnerable session key buffer used in PKESK packet generation.

The defect was introduced in commit `7bd9a8dc356aae756b40755be76d36205b6b161a` where initialization
logic inside `encrypted_build_skesk()` only randomized the key for the
SKESK path and omitted it for the PKESK path.

Basic Information

ID CVE-2025-13470

Source Ribose

Published Nov 21, 2025 at 17:05

Modified Nov 21, 2025 at 17:35

Affected Product

Vendor Ribose

Product RNP

Version 0.18.0

Affected Versions Ribose RNP 0.18.0

CWE Classification

CWE-330

References

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    "description": "In RNP version 0.18.0 a refactoring regression causes the symmetric \nsession key used for Public-Key Encrypted Session Key (PKESK) packets to\n be left uninitialized except for zeroing, resulting in it always being \nan all-zero byte array.\n\nAny data encrypted using public-key encryption \nin this release can be decrypted trivially by supplying an all-zero \nsession key, fully compromising confidentiality.\n\nThe vulnerability affects only public key encryption (PKESK packets).\u00a0 Passphrase-based encryption (SKESK packets) is not affected.\n\nRoot cause: Vulnerable session key buffer used in PKESK packet generation.\n\n\n\nThe defect was introduced in commit `7bd9a8dc356aae756b40755be76d36205b6b161a` where initialization \nlogic inside `encrypted_build_skesk()` only randomized the key for the \nSKESK path and omitted it for the PKESK path.",
    "published": "2025-11-21T17:05:15.683Z",
    "modified": "2025-11-21T17:35:33.645Z",
    "type": "cve",
    "title": "RNP 0.18.0 Vulnerable PKESK session keys",
    "source": "Ribose",
    "references": "https://github.com/rnpgp/rnp/commit/7bd9a8dc356aae756b40755be76d36205b6b161a\nhttps://launchpad.net/ubuntu/+source/rnp\nhttps://aur.archlinux.org/packages/rnp\nhttps://packages.gentoo.org/packages/dev-util/librnp\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2415863\nhttps://access.redhat.com/security/cve/cve-2025-13402\nhttps://open.ribose.com/advisories/ra-2025-11-20/\nhttps://github.com/rnpgp/rnp/releases/tag/v0.18.1",
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