1) Input validation error

Severity: Medium

CVSSv3:
4.6 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID:
CVE-2020-7957

CWE-ID:
CWE-20 – Improper Input Validation

Description

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

The vulnerability exists due to insufficient validation of user-supplied input within the IMAP and LMTP components when many characters must be read while computing the snippet and a trailing “>” character is present. As a result the recipient cannot read all messages in the mailbox.

Mitigation

Install updates from vendor’s website.

Vulnerable software versions

Dovecot:
2.3.9, 2.3.9.1, 2.3.9.2

CPE
External links

http://www.openwall.com/lists/oss-security/2020/02/12/2
https://dovecot.org/pipermail/dovecot-news/2020-February/000430.html
https://dovecot.org/security

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.





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