{"id":"UBUNTU-CVE-2018-5382","details":"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to cause a security issue in itself.","modified":"2025-07-16T08:23:02.156245Z","published":"2018-04-16T14:29:00Z","withdrawn":"2025-07-18T16:44:28Z","upstream":["CVE-2018-5382"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-5382"},{"type":"REPORT","url":"https://insights.sei.cmu.edu/cert/2018/03/the-curious-case-of-the-bouncy-castle-bks-passwords.html"},{"type":"REPORT","url":"https://www.kb.cert.org/vuls/id/306792"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-5382"}],"affected":[{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/bouncycastle@1.49+dfsg-2?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.49+dfsg-2"}]}],"versions":["1.48+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.49+dfsg-2","binary_name":"libbcmail-java"},{"binary_version":"1.49+dfsg-2","binary_name":"libbcmail-java-doc"},{"binary_version":"1.49+dfsg-2","binary_name":"libbcpg-java"},{"binary_version":"1.49+dfsg-2","binary_name":"libbcpg-java-doc"},{"binary_version":"1.49+dfsg-2","binary_name":"libbcpkix-java"},{"binary_version":"1.49+dfsg-2","binary_name":"libbcpkix-java-doc"},{"binary_version":"1.49+dfsg-2","binary_name":"libbcprov-java"},{"binary_version":"1.49+dfsg-2","binary_name":"libbcprov-java-doc"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-5382.json"}},{"package":{"name":"bouncycastle","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/bouncycastle@1.51-4ubuntu1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.51-4ubuntu1"}]}],"versions":["1.49+dfsg-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.51-4ubuntu1","binary_name":"libbcmail-java"},{"binary_version":"1.51-4ubuntu1","binary_name":"libbcmail-java-doc"},{"binary_version":"1.51-4ubuntu1","binary_name":"libbcpg-java"},{"binary_version":"1.51-4ubuntu1","binary_name":"libbcpg-java-doc"},{"binary_version":"1.51-4ubuntu1","binary_name":"libbcpkix-java"},{"binary_version":"1.51-4ubuntu1","binary_name":"libbcpkix-java-doc"},{"binary_version":"1.51-4ubuntu1","binary_name":"libbcprov-java"},{"binary_version":"1.51-4ubuntu1","binary_name":"libbcprov-java-doc"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-5382.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}