#VU29697 Buffer overflow in Tokio Tls

Vulnerability identifier: #VU29697

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: N/A

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Tokio Tls
Other software / Other software solutions

Vendor: tokio-rs

Description

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

The vulnerability exists due to a boundary error when the affected software does not call "process_new_packets" immediately after "read", so the expected termination condition "wants_read" always returns true. A remote attacker can trigger memory corruption and cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Tokio Tls: 0.12

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External links
https://rustsec.org/advisories/RUSTSEC-2020-0019.html
https://github.com/tokio-rs/tls/pull/14

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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.