The following issues were fixed in the 1.11.29 release of botan: (CVE-2016-2849): ECDSA side channel ECDSA (and DSA) signature algorithms perform a modular inverse on the signature nonce k. The modular inverse algorithm used had input dependent loops, and it is possible a side channel attack could recover sufficient information about the nonce to eventually recover the ECDSA secret key. Found by Sean Devlin. Introduced in 1.7.15, fixed in 1.11.29 2016-03-17 (CVE-2016-2850): Failure to enforce TLS policy TLS v1.2 allows negotiating which signature algorithms and hash functions each side is willing to accept. However received signatures were not actually checked against the specified policy. This had the effect of allowing a server to use an MD5 or SHA-1 signature, even though the default policy prohibits it. The same issue affected client cert authentication. The TLS client also failed to verify that the ECC curve the server chose to use was one which was acceptable by the client policy. Introduced in 1.11.0, fixed in 1.11.29 Reference: http://botan.randombit.net/security.html#id1 Upstream patches: https://github.com/randombit/botan/commit/bcf13fa153a11b3e0ad54e2af6962441cea3adf1
Created botan tracking bugs for this issue: Affects: fedora-all [bug 1330876] Affects: epel-all [bug 1330877]
This bug is slightly imprecise: - CVE-2016-2850 does not affect us, as it was introduced in 1.11.0, fixed in 1.11.29. All Fedora/EPEL branches carry 1.10.X and 1.8.X branches though. - CVE-2016-2849 is fixed in 1.11.29, but also in 1.10.13. - Version 1.10.13 also fixes CVE-2015-7827. So, all Fedora branches as well as EPEL7 will be updated to 1.10.13.
botan-1.10.13-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
botan-1.10.13-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
botan-1.10.13-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
botan-1.10.13-1.el7 has been pushed to the Fedora EPEL 7 stable repository. If problems still persist, please make note of it in this bug report.