Vulnerability identifier: #VU54561

Vulnerability risk: Low

CVSSv3.1: 3.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-35525

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
postsrsd
Server applications / Mail servers

Vendor: roehling (Timo Röhling)

Description

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

The vulnerability exists due to insufficient validation of input when processing certain log data fields from Postfix, such as multiple concatenated email addresses. A remote attacker can force Postfix under certain circumstances pass specially crafted input to the application and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

postsrsd: 1.0 - 1.10

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External links
http://github.com/roehling/postsrsd/commit/077be98d8c8a9847e4ae0c7dc09e7474cbe27db2
http://bugs.gentoo.org/793674
http://github.com/roehling/postsrsd/releases/tag/1.11

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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.