#VU53962 Resource exhaustion in SPICE - CVE-2021-20201

Vulnerability identifier: #VU53962

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-20201

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
SPICE
Universal components / Libraries / Software for developers

Vendor: SPICE

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources. A remote attacker can execute multiple renegotiations within a single connection and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SPICE: 0.14.0 - 0.14.91

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External links
https://blog.qualys.com/product-tech/2011/10/31/tls-renegotiation-and-denial-of-service-attacks
https://bugzilla.redhat.com/show_bug.cgi?id=1921846

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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.