CVE-2016-6129

Publication date 13 February 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

The rsa_verify_hash_ex function in rsa_verify_hash.c in LibTomCrypt, as used in OP-TEE before 2.2.0, does not validate that the message length is equal to the ASN.1 encoded data length, which makes it easier for remote attackers to forge RSA signatures or public certificates by leveraging a Bleichenbacher signature forgery attack.

From the Ubuntu Security Team

It was discovered that LibTomCrypt incorrectly handled RSA signatures or public certificates. An attacker could possibly use this issue to make a Bleichenbacher signature forgery attack.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libtomcrypt	18.04 LTS bionic	Not affected
	17.10 artful	Ignored end of life
	17.04 zesty	Ignored end of life
	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Fixed 1.17-7ubuntu0.1
	14.04 LTS trusty	Fixed 1.17-5ubuntu0.1
	12.04 LTS precise	Fixed 1.17-3.2+deb7u1ubuntu0.1

Notes

tyhicks

Per Debian's security tracker, the underlying issue looks to be in libtomcrypt

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N