| Name | CVE-2018-5382 |
| Description | The default BKS keystore use an HMAC that is only 16 bits long, which can allow an attacker to compromise the integrity of a BKS keystore. Bouncy Castle release 1.47 changes the BKS format to a format which uses a 160 bit HMAC instead. This applies to any BKS keystore generated prior to BC 1.47. For situations where people need to create the files for legacy reasons a specific keystore type "BKS-V1" was introduced in 1.49. It should be noted that the use of "BKS-V1" is discouraged by the library authors and should only be used where it is otherwise safe to do so, as in where the use of a 16 bit checksum for the file integrity check is not going to cause a security issue in itself. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| bouncycastle (PTS) | jessie, jessie (lts) | 1.49+dfsg-3+deb8u3 | fixed |
| stretch (security) | 1.56-1+deb9u3 | fixed |
| stretch (lts), stretch | 1.56-1+deb9u4 | fixed |
| buster (security), buster, buster (lts) | 1.60-1+deb10u1 | fixed |
| bullseye | 1.68-2 | fixed |
| bookworm | 1.72-2 | fixed |
| sid, trixie | 1.77-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| bouncycastle | source | (unstable) | 1.48+dfsg-2 | | | |
Notes
[wheezy] - bouncycastle <ignored> (this only affects the integrity verification and not the content of the BKS keystore)
https://insights.sei.cmu.edu/cert/2018/03/the-curious-case-of-the-bouncy-castle-bks-passwords.html
https://www.kb.cert.org/vuls/id/306792
Issue fixed in 1.47 upstream. The default MAC for a BKS key store was
2 bytes before and has been upgraded to 20 bytes.