sympa version 6.2.16 and later contains a CWE-601: URL Redirection to Untrusted Site ('Open Redirect') vulnerability in The "referer" parameter of the wwsympa.fcgi login action. that can result in Open redirection and reflected XSS via data URIs. This attack appear to be exploitable via Victim's browser must follow a URL supplied by the attacker. This vulnerability appears to have been fixed in none available.

The remote Ubuntu 16.04 ESM / 18.04 ESM / 20.04 ESM host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-4442-2 advisory.

    USN-4442-1 fixed vulnerabilities in Sympa. This update provides the corresponding updates for Ubuntu 16.04     ESM, Ubuntu 18.04 ESM and Ubuntu 20.04 ESM.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

A privilege escalation was discovered in Sympa, a modern mailing list manager. It is fixed when Sympa is used in conjunction with common MTAs (such as Exim or Postfix) by disabling a setuid executable, although no fix is currently available for all environments (such as sendmail). Additionally, an open-redirect vulnerability was discovered and fixed.

CVE-2020-26880

Sympa allows a local privilege escalation from the sympa user account to full root access by modifying the sympa.conf configuration file (which is owned by sympa) and parsing it through the setuid sympa_newaliases-wrapper executable.

CVE-2018-1000671

Sympa contains a CWE-601: URL Redirection to Untrusted Site ('Open Redirect') vulnerability in The 'referer' parameter of the wwsympa.fcgi login action. that can result in Open redirection and reflected XSS via data URIs.

For Debian 9 stretch, these problems have been fixed in version 6.2.16~dfsg-3+deb9u4.

We recommend that you upgrade your sympa packages.

For the detailed security status of sympa please refer to its security tracker page at: https://security-tracker.debian.org/tracker/sympa

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

An Open Redirect vulnerability has been discovered in sympa. The 'referer' parameter of the wwsympa.fcgi login action can result in Open redirection and potential Cross Site Scripting via data URIs.
This attack appear to be exploitable via Victim browser opening a crafted URL supplied by the attacker.

For Debian 8 'Jessie', this problem has been fixed in version 6.1.23~dfsg-2+deb8u3.

We recommend that you upgrade your sympa packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
183602	Ubuntu 16.04 ESM / 18.04 ESM / 20.04 ESM : Sympa vulnerabilities (USN-4442-2)	Nessus	Ubuntu Local Security Checks	critical
142670	Debian DLA-2441-1 : sympa security update	Nessus	Debian Local Security Checks	high
117620	Debian DLA-1512-1 : sympa security update	Nessus	Debian Local Security Checks	medium

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CVE-2018-1000671

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