Denial of service in Sympa

1) Resource exhaustion

EUVDB-ID: #VU49166

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 - Resource exhaustion

Exploit availability: No

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

CPE2.3

• cpe:2.3:a:sympa_org:sympa:6.2.38:*:*:*:*:*:*:*
• cpe:2.3:a:sympa_org:sympa:6.2.40:*:*:*:*:*:*:*
• cpe:2.3:a:sympa_org:sympa:6.2.41:*:*:*:*:*:*:*

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

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.