#VU49166 Resource exhaustion in Sympa - CVE-2020-9369

Vulnerability identifier: #VU49166

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-2020-9369

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Sympa
Server applications / Mail servers

Vendor: sympa.org

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 send a series of requests with malformed parameters and consume all available disk space by creating temporary files.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Sympa: 6.2.38 - 6.2.52

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External links
https://github.com/sympa-community/sympa/issues/886
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6TMVZ5LVYCCIHGEC7RQUMGUE7DJWUXN7/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/A3FUYYLV6URRLAJVWXNJYK2CNOKKNHXC/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/XO4WJYNNHWM7DUKCN4EWYYYPXZSOI7BQ/
https://sympa-community.github.io/security/2020-001.html
https://www.debian.org/security/2020/dsa-4818

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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.