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Vulnerability of Sympa: open redirect via wwsympa.fcgi

Synthesis of the vulnerability 

An attacker can deceive the user via wwsympa.fcgi of Sympa, in order to redirect him to a malicious site.
Vulnerable software: Debian, Ubuntu.
Severity of this announce: 1/4.
Creation date: 21/09/2018.
Références of this computer vulnerability: CVE-2018-1000671, DLA-1512-1, DLA-2441-1, USN-4442-1, VIGILANCE-VUL-27277.

Description of the vulnerability 

The Sympa product offers a web service.

However, the web service accepts to redirect the victim with no warning, to an external site indicated by the attacker.

An attacker can therefore deceive the user via wwsympa.fcgi of Sympa, in order to redirect him to a malicious site.
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This weakness announce impacts software or systems such as Debian, Ubuntu.

Our Vigil@nce team determined that the severity of this vulnerability alert is low.

The trust level is of type confirmed by the editor, with an origin of internet client.

An attacker with a expert ability can exploit this computer threat announce.

Solutions for this threat 

Debian 8: new sympa packages.
New packages are available:
  Debian 8: sympa 6.1.23~dfsg-2+deb8u3

Debian 9: new sympa packages.
New packages are available:
  Debian 9: sympa 6.2.16~dfsg-3+deb9u4

Ubuntu 14.04: new sympa packages.
New packages are available:
  Ubuntu 14.04 ESM: sympa 6.1.17~dfsg-1ubuntu0.1~esm1
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