Ensure CDE daemons have sgid and suid mode disabled

AltaNivel 1Automatizadaaix

Descripción

CDE buffer overflow vulnerabilities may be exploited by a local user to obtain root privilege via suid/sgid programs owned by root:bin or root:sys. CDE has been associated with major security risks, most of which are buffer overflow vulnerabilities. These vulnerabilities may be exploited by a local user to obtain root privilege via suid/sgid programs owned by root:bin or root:sys. Audit: compares `ls -ld` mode (or more restrictive), owner and group; an absent file is compliant.

Cómo se verifica

Método de auditoría: Comando de shell

shell

r=compliant; for f in /usr/dt/bin/dtaction; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='r-xr-xr-x' -v o='root' -v g='sys' '{ok=1; for(i=1;i<=9;i++) if(substr(m,i,1)=="-" && substr($1,i+1,1)!="-") ok=0; if(o!="" && $2 !~ ("^(" o ")$")) ok=0; if(g!="" && $3 !~ ("^(" g ")$")) ok=0; print (ok ? "ok" : $0)}'); [ "$s" = ok ] || r="$f: $s"; else :; fi; done; for f in /usr/dt/bin/dtappgather; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='r-xr-xr-x' -v o='root' -v g='bin' '{ok=1; for(i=1;i<=9;i++) if(substr(m,i,1)=="-" && substr($1,i+1,1)!="-") ok=0; if(o!="" && $2 !~ ("^(" o ")$")) ok=0; if(g!="" && $3 !~ ("^(" g ")$")) ok=0; print (ok ? "ok" : $0)}'); [ "$s" = ok ] || r="$f: $s"; else :; fi; done; for f in /usr/dt/bin/dtprintinfo; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='r-xr-xr-x' -v o='root' -v g='bin' '{ok=1; for(i=1;i<=9;i++) if(substr(m,i,1)=="-" && substr($1,i+1,1)!="-") ok=0; if(o!="" && $2 !~ ("^(" o ")$")) ok=0; if(g!="" && $3 !~ ("^(" g ")$")) ok=0; print (ok ? "ok" : $0)}'); [ "$s" = ok ] || r="$f: $s"; else :; fi; done; for f in /usr/dt/bin/dtsession; do if [ -e "$f" ]; then set -- $(ls -ld "$f"); s=$(printf '%s %s %s\n' "$1" "$3" "$4" | awk -v m='r-xr-xr-x' -v o='root' -v g='bin' '{ok=1; for(i=1;i<=9;i++) if(substr(m,i,1)=="-" && substr($1,i+1,1)!="-") ok=0; if(o!="" && $2 !~ ("^(" o ")$")) ok=0; if(g!="" && $3 !~ ("^(" g ")$")) ok=0; print (ok ? "ok" : $0)}'); [ "$s" = ok ] || r="$f: $s"; else :; fi; done; echo "$r"

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Remove the suid/sgid from the following CDE binaries: chmod ug-s /usr/dt/bin/dtaction chmod ug-s /usr/dt/bin/dtappgather chmod ug-s /usr/dt/bin/dtprintinfo chmod ug-s /usr/dt/bin/dtsession

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: aixservices
Referencia: CIS IBM AIX 7 Benchmark v1.2.0 - 4.6.1.5 Ensure CDE daemons have sgid and suid mode disabled

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target aix