#VU53978 Input validation error in Nettle - CVE-2021-3580

Vulnerability identifier: #VU53978

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-3580

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Nettle
Universal components / Libraries / Libraries used by multiple products

Vendor: GNU

Description

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

The vulnerability exists in nettle's RSA decryption functions due to insufficient validation of certain ciphertexts. A remote attacker can send specially crafted  data to the server and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nettle: 3.0 - 3.7.2

---

External links
https://bugzilla.redhat.com/show_bug.cgi?id=1967983
https://git.lysator.liu.se/nettle/nettle/-/commit/0ad0b5df315665250dfdaa4a1e087f4799edaefe
https://git.lysator.liu.se/nettle/nettle/-/commit/485b5e2820a057e873b1ba812fdb39cae4adf98c

---

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.