untrusted comment: verify with openbsd-68-base.pub
RWQZj25CSG5R2h76OAipWi3qSZUhwLv96vhZzSSVFnJHuTrfX8iwN/0sVdu00WUulA+7qO4djC6JJMbGEU6y5kyJHzF7H0pT5Qw=
OpenBSD 6.8 errata 030, Sep 27, 2021:
sshd(8) failed to clear supplemental groups when executing an
AuthorizedUsersCommand or AuthorizedPrincipalsCommand helper program.
Apply by doing:
signify -Vep /etc/signify/openbsd-68-base.pub -x 030_sshd.patch.sig \
-m - | (cd /usr/src && patch -p0)
And then rebuild and install sshd(8)
cd /usr/src/usr.bin/ssh
make obj
make
make install
Index: usr.bin/ssh/auth.c
===================================================================
RCS file: /cvs/src/usr.bin/ssh/auth.c,v
retrieving revision 1.147
diff -u -p -u -r1.147 auth.c
--- usr.bin/ssh/auth.c 27 Aug 2020 01:07:09 -0000 1.147
+++ usr.bin/ssh/auth.c 16 Sep 2021 16:28:29 -0000
@@ -825,6 +825,12 @@ subprocess(const char *tag, struct passw
}
closefrom(STDERR_FILENO + 1);
+ if (geteuid() == 0 &&
+ initgroups(pw->pw_name, pw->pw_gid) == -1) {
+ error("%s: initgroups(%s, %u): %s", tag,
+ pw->pw_name, (u_int)pw->pw_gid, strerror(errno));
+ _exit(1);
+ }
/* Don't use permanently_set_uid() here to avoid fatal() */
if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) {
error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,
