Add kernelCTF CVE-2023-4147_lts_cos

pocs/linux/kernelctf/CVE-2023-4147_lts_cos/docs/vulnerability.md

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+- Requirements:
+    - Capabilites: CAP_NET_ADMIN
+    - Kernel configuration: CONFIG_NETFILTER=y, CONFIG_NF_TABLES=y
+    - User namespaces required: Yes
+- Introduced by: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d0e2c7de92c7
+- Fixed by: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0ebc1064e4874d5987722a2ddbc18f94aa53b211
+- Affected Version: v5.9-rc1 - v6.5-rc3
+- Affected Component: net/netfilter
+- Syscall to disable: disallow unprivileged username space
+- URL: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2023-4147
+- Cause: Use-After-Free
+- Description: A use-after-free flaw was found in the Linux kernel's Netfilter functionality when adding a rule with NFTA_RULE_CHAIN_ID. This flaw allows a local user to crash or escalate their privileges on the system.

pocs/linux/kernelctf/CVE-2023-4147_lts_cos/exploit/cos-105-17412.101.42/Makefile

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+LIBMNL_DIR = $(realpath ./)/libmnl_build
+LIBNFTNL_DIR = $(realpath ./)/libnftnl_build
+
+LIBS = -L$(LIBNFTNL_DIR)/install/lib -L$(LIBMNL_DIR)/install/lib -lnftnl -lmnl
+INCLUDES = -I$(LIBNFTNL_DIR)/libnftnl-1.2.5/include -I$(LIBMNL_DIR)/libmnl-1.0.5/include
+CFLAGS = -static -s
+
+exploit:
+	gcc -o exploit exploit.c $(LIBS) $(INCLUDES) $(CFLAGS)
+
+prerequisites: libnftnl-build
+
+libmnl-build : libmnl-download
+	tar -C $(LIBMNL_DIR) -xvf $(LIBMNL_DIR)/libmnl-1.0.5.tar.bz2
+	cd $(LIBMNL_DIR)/libmnl-1.0.5 && ./configure --enable-static --prefix=`realpath ../install`
+	cd $(LIBMNL_DIR)/libmnl-1.0.5 && make -j`nproc`
+	cd $(LIBMNL_DIR)/libmnl-1.0.5 && make install
+
+libnftnl-build : libmnl-build libnftnl-download
+	tar -C $(LIBNFTNL_DIR) -xvf $(LIBNFTNL_DIR)/libnftnl-1.2.5.tar.xz
+	cp rule.c $(LIBNFTNL_DIR)/libnftnl-1.2.5/src/
+	cp rule.h $(LIBNFTNL_DIR)/libnftnl-1.2.5/include/
+	cp libnftnl_rule.h $(LIBNFTNL_DIR)/libnftnl-1.2.5/include/libnftnl/rule.h
+	cd $(LIBNFTNL_DIR)/libnftnl-1.2.5 && PKG_CONFIG_PATH=$(LIBMNL_DIR)/install/lib/pkgconfig ./configure --enable-static --prefix=`realpath ../install`
+	cd $(LIBNFTNL_DIR)/libnftnl-1.2.5 && C_INCLUDE_PATH=$(C_INCLUDE_PATH):$(LIBMNL_DIR)/install/include LD_LIBRARY_PATH=$(LD_LIBRARY_PATH):$(LIBMNL_DIR)/install/lib make -j`nproc`
+	cd $(LIBNFTNL_DIR)/libnftnl-1.2.5 && make install
+
+libmnl-download :
+	mkdir $(LIBMNL_DIR)
+	wget -P $(LIBMNL_DIR) https://netfilter.org/projects/libmnl/files/libmnl-1.0.5.tar.bz2
+
+libnftnl-download :
+	mkdir $(LIBNFTNL_DIR)
+	wget -P $(LIBNFTNL_DIR) https://netfilter.org/projects/libnftnl/files/libnftnl-1.2.5.tar.xz
+
+run:
+	./exploit
+
+clean:
+	rm -f exploit
+	rm -rf $(LIBMNL_DIR)
+	rm -rf $(LIBNFTNL_DIR)