untrusted comment: verify with openbsd-71-base.pub
RWR2eHwZTOEiTdcdKdiTHOQXBbmwOjSAQF8p2vjvE6QO4MVOM0m3Kwj5/DpV5CqggoO9EVq9X2gtYdF2t1h7fwLHwhsYEMuLHQo=
OpenBSD 7.1 errata 027, March 23, 2023:
Incorrect length checks allow an out-of-bounds read in bgpd(8).
Apply by doing:
signify -Vep /etc/signify/openbsd-71-base.pub -x 027_bgpd.patch.sig \
-m - | (cd /usr/src && patch -p0)
And then rebuild and install bgpd(8):
cd /usr/src/usr.sbin/bgpd
make obj
make
make install
Index: usr.sbin/bgpd/rde.c
===================================================================
RCS file: /cvs/src/usr.sbin/bgpd/rde.c,v
diff -u -p -r1.544.2.1 rde.c
--- usr.sbin/bgpd/rde.c 1 Aug 2022 11:02:16 -0000 1.544.2.1
+++ usr.sbin/bgpd/rde.c 21 Mar 2023 12:29:51 -0000
@@ -1943,7 +1943,7 @@ bad_flags:
goto bad_flags;
goto optattr;
case ATTR_MP_REACH_NLRI:
- if (attr_len < 4)
+ if (attr_len < 5)
goto bad_len;
if (!CHECK_FLAGS(flags, ATTR_OPTIONAL, 0))
goto bad_flags;
@@ -2109,7 +2109,7 @@ rde_get_mp_nexthop(u_char *data, uint16_
totlen = 1;
len--;
- if (nhlen > len)
+ if (nhlen + 1 > len)
return (-1);
bzero(&nexthop, sizeof(nexthop));
