CVE-2018-12435

Publication date 15 June 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Botan 2.5.0 through 2.6.0 before 2.7.0 allows a memory-cache side-channel attack on ECDSA signatures, aka the Return Of the Hidden Number Problem or ROHNP, related to dsa/dsa.cpp, ec_group/ec_group.cpp, and ecdsa/ecdsa.cpp. To discover an ECDSA key, the attacker needs access to either the local machine or a different virtual machine on the same physical host.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
botan	19.10 eoan	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not in release
botan1.10	19.10 eoan	Not in release
	19.04 disco	Not in release
	18.10 cosmic	Ignored end of life
	18.04 LTS bionic	Not affected
	17.10 artful	Ignored end of life
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

msalvatore

From the release notes, "versions before 2.5.0 are not affected"

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
botan	Upstream: 48fc8df

Severity score breakdown

Parameter	Value
Base score	5.9 · Medium
Attack vector	Local
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Changed
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N