debian/sympa.postinst for the Debian Sympa package before 6.2.40~dfsg-7 uses mode 4755 for sympa_newaliases-wrapper, whereas the intended permissions are mode 4750 (for access by the sympa group)
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-26932
Reference (s):
- DEBIAN:DSA-4818
- URL: https://www.debian.org/security/2020/dsa-4818
- https://bugs.debian.org/971904
- https://salsa.debian.org/sympa-team/sympa/-/merge_requests/1