Key Management Errors Affecting botan package, versions <2.9.0-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN10-BOTAN-268767
- published8 Jan 2019
- disclosed8 Mar 2019
Introduced: 8 Jan 2019
CVE-2018-20187 (opens in a new tab)How to fix?
Upgrade Debian:10 botan to version 2.9.0-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream botan package and not the botan package as distributed by Debian.
See How to fix? for Debian:10 relevant fixed versions and status.
A side-channel issue was discovered in Botan before 2.9.0. An attacker capable of precisely measuring the time taken for ECC key generation may be able to derive information about the high bits of the secret key, as the function to derive the public point from the secret scalar uses an unblinded Montgomery ladder whose loop iteration count depends on the bitlength of the secret. This issue affects only key generation, not ECDSA signatures or ECDH key agreement.
References
- https://security-tracker.debian.org/tracker/CVE-2018-20187
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-20187
- https://botan.randombit.net/news.html
- https://botan.randombit.net/security.html
- https://github.com/crocs-muni/ECTester
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-20187