Key management errors in Randombit Botan
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2018-20187 |
| CWE-ID | CWE-320 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Botan Universal components / Libraries / Libraries used by multiple products |
| Vendor | Randombit |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Key management errors
EUVDB-ID: #VU33132
Risk: Medium
CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-20187
CWE-ID:
CWE-320 - Key Management Errors
Exploit availability: No
DescriptionThe vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.
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.
MitigationInstall update from vendor's website.
Vulnerable software versionsBotan: 2.0.0 - 2.8.0
External linkshttp://botan.randombit.net/news.html
http://botan.randombit.net/security.html
http://github.com/crocs-muni/ECTester
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
