CVE-2019-20446

In xml.rs in GNOME librsvg before 2.46.2, a crafted SVG file with nested patterns can cause denial of service when passed to the library for processing. The attacker constructs pattern elements so that the number of final rendered objects grows exponentially.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

Name	Vendor	Start Version	End Version
Librsvg	Gnome	*	2.40.21 (excluding)
Librsvg	Gnome	2.42.0 (including)	2.42.8 (excluding)
Librsvg	Gnome	2.44.0 (including)	2.44.16 (excluding)
Red Hat Enterprise Linux 8	RedHat	librsvg2-0:2.42.7-4.el8	*
Librsvg	Ubuntu	bionic	*
Librsvg	Ubuntu	eoan	*
Librsvg	Ubuntu	esm-infra/bionic	*
Librsvg	Ubuntu	esm-infra/xenial	*
Librsvg	Ubuntu	trusty	*
Librsvg	Ubuntu	upstream	*
Librsvg	Ubuntu	xenial	*

Potential Mitigations

Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

NVD	https://nvd.nist.gov/vuln/detail/CVE-2019-20446
CWE	https://cwe.mitre.org/data/definitions/400.html

Uncontrolled Resource Consumption

Weakness

Affected Software

Potential Mitigations

References

CVE-2019-20446

Uncontrolled Resource Consumption

Weakness

Affected Software

Potential Mitigations

Related Attack Patterns

References