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CVE-2023-52927 is an expectation-lifecycle flaw in Linux kernel netfilter connection tracking. When nf_conntrack_in() calls nf_ct_find_expectation(), an expectation is removed from its hash table even in situations where the newly created connection-tracking entry will not be confirmed. Such situations include Open vSwitch (OVS) and traffic-control (TC) conntrack processing, where the expectation should remain available. The fix permits retention of the expectation by setting IPS_CONFIRMED in the connection-tracking template's status.
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2 valid exploits after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a full local privilege escalation exploit for CVE-2023-52927, a use-after-free vulnerability in the Linux kernel's netfilter subsystem. The main exploit is implemented in C (CVE-2023-52927/exploit.c) and is supported by several helper files (helpers.c, helpers.h, helpers_nfqueue.c, helpers_nfqueue.h) that abstract netlink and netfilter operations. The exploit works by carefully manipulating netfilter tables, chains, and rules via netlink sockets, triggering a use-after-free condition in kernel memory, and then hijacking control flow to execute a ROP chain for privilege escalation. After successful exploitation, the process joins the init process's namespaces and spawns a root shell. The repository also includes a KASAN PoC (CVE-2023-52927/reproducer/kasan_trigger_poc.c) for triggering the bug and verifying kernel memory corruption, as well as scripts for setting up a QEMU environment with the vulnerable kernel. The exploit targets Linux kernel versions 5.18.0 through 6.5.13, as detailed in the documentation. The attack vector is local, requiring the ability to execute code on the target system. Several fingerprintable endpoints are present, including references to /proc/1/ns/* files, /bin/bash, and the use of UDP packets to 127.0.0.1:56789 to trigger netfilter processing. The repository is well-structured, with clear separation between exploit, helper, and environment setup code.
This repository contains a local privilege escalation (LPE) exploit for CVE-2023-52927, a use-after-free vulnerability in the Linux kernel's netfilter subsystem. The main exploit is implemented in 'exploit.c', which orchestrates a complex sequence of netfilter table, chain, and rule manipulations to trigger the vulnerability and achieve arbitrary kernel memory write. The exploit then leverages this to escalate privileges and spawn a root shell. The exploit is specifically tested against the kCTF cos-109-17800.436.33 kernel, but the vulnerability affects a wide range of Linux kernel versions (5.18.x through 6.5.13). The repository also includes a 'reproducer' directory with a KASAN PoC for triggering the bug and verifying kernel vulnerability. The Makefiles automate building the exploit and its dependencies, which include several netfilter-related libraries. The exploit requires local access to the target system and is not a remote exploit. The endpoints used include local file paths for namespace manipulation, UDP packets sent to localhost on port 56789 to trigger netfilter processing, and reference URLs for the target kernel environment. The exploit is operational and provides a working root shell if successful.
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A Linux kernel Netfilter connection-tracking vulnerability involving premature removal of expectation entries when the newly created connection will not be confirmed, including OVS and TC conntrack scenarios. The fix allows expectations to remain by setting IPS_CONFIRMED in the template status. The reference assigns a CVSS v3 base score of 7.8, indicating local exploitation requiring low privileges and potentially high confidentiality, integrity, and availability impacts. It recommends updating the linux package and related packages to version 6.1.133-1 or later.
A Linux kernel Netfilter connection-tracking expectation handling flaw in nf_ct_find_expectation(). It can improperly remove an expectation from the hash table in scenarios where a newly created connection-tracking entry is not confirmed, including OVS and TC conntrack workflows.
A vulnerability addressed by the referenced TuxCare CentOS 6 security advisory; no technical vulnerability details are provided.
Unknown
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