CVE-2019-17362

Published: 9 October 2019

In LibTomCrypt through 1.18.2, the der_decode_utf8_string function (in der_decode_utf8_string.c) does not properly detect certain invalid UTF-8 sequences. This allows context-dependent attackers to cause a denial of service (out-of-bounds read and crash) or read information from other memory locations via carefully crafted DER-encoded data.

From the Ubuntu Security Team

It was discovered that LibTomCrypt incorrectly handled certain inputs. An attacker could possibly use this issue to cause a denial of service or read sensitive information.

Priority

Cvss 3 Severity Score

9.1

Score breakdown

Status

Package	Release	Status
libtomcrypt Launchpad, Ubuntu, Debian	bionic	Released (1.18.1-1ubuntu0.1+esm1) Available with Ubuntu Pro
	disco	Ignored (end of life)
	eoan	Ignored (end of life)
	focal	Not vulnerable (1.18.2-3)
	groovy	Not vulnerable (1.18.2-3)
	hirsute	Not vulnerable (1.18.2-3)
	impish	Not vulnerable (1.18.2-3)
	jammy	Not vulnerable (1.18.2-3)
	kinetic	Not vulnerable (1.18.2-3)
	lunar	Not vulnerable (1.18.2-3)
	trusty	Released (1.17-5ubuntu0.1+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	upstream	Released (1.17-6+deb8u1)
	xenial	Released (1.17-7ubuntu0.1+esm1) Available with Ubuntu Pro

Severity score breakdown

Parameter	Value
Base score	9.1
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References

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