Suricata vulnerabilities

Suricata before versions 8.0.3 and 7.0.14 contains an unsigned integer overflow that can lead to a heap use-after-free condition when generating excessive amounts of alerts for a single packet. The issue is fixed in versions 8.0.3 and 7.0.14.

Suricata, a network IDS, IPS and NSM engine, can crash with a stack overflow. The vulnerability affects versions from 8.0.0 up to 8.0.2, and version 8.0.3 patches the issue.

Suricata before versions 8.0.3 and 7.0.14 has a vulnerability to excessive memory consumption while parsing DNP3 traffic. Specially crafted traffic can slow down the process and lead to memory exhaustion, potentially causing the process to be killed by the OOM killer.

Suricata before versions 8.0.3 and 7.0.14 has a vulnerability that allows crafted DCERPC traffic to cause unbounded buffer expansion, leading to memory exhaustion and process termination. The issue affects DCERPC over UDP and likely also over TCP and SMB. Patches are available in versions 8.0.3 and 7.0.14.

In Suricata before version 4.x, it was possible to trigger many redundant checks on the content of crafted network traffic due to a bug in DetectEngineContentInspection. The search engine did not stop when no match was found, leading to exceeding the inspection recursion limit.

Suricata before version 3.2.1 has an IPv4 defragmentation evasion issue caused by lack of a check for the IP protocol during fragment matching.

Use-after-free vulnerability in Suricata before 8.0.7 occurs in the Http2ThreadMultiBuf mechanism when a transaction is inspected by rules using http.response_header with and without a transform.

In Suricata before 8.0.7, a type confusion in DoH2 can cause an invalid free because cleanup code for HTTP2 state runs even though the actual state is HTTP1 (when there is a DoH2 request with an HTTP1 to HTTP2 upgrade). This requires app-layer.protocols.doh2 to be enabled, which is default in 8.x versions.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, a protocol change while processing HTTP/2 traffic could lead to type confusion, causing Suricata to crash and resulting in denial of service.

In Suricata before version 6.0.13, an adversary controlling an external source of Lua rules may be able to execute Lua code. This issue is addressed in version 6.0.13 by disabling Lua unless the allow-rules option is set to true in the Lua security configuration section.

The MemcmpLowercase function in Suricata before version 2.0.6 improperly excludes the first byte from comparisons, which might allow remote attackers to bypass intrusion-prevention functionality via a crafted HTTP request.

Vulnerability in Suricata allows treating IPv4 and IPv6 flows as equal without comparing IP family when raw address words, ports, protocol, VLAN, recursion level, live device, and hash bucket align. This can cause incorrect flowbit state, detection bypass, or IP-only bypass.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, DNS-over-HTTP/2 processing in rust/src/http2/http2.rs retains previously processed HTTP/2 DATA frame contents instead of clearing the internal buffer. Multiple DATA frames with the EndOfStream flag set can grow the buffer to its 65 KiB limit while causing all prior contents to be processed again, producing quadratic CPU complexity, degraded packet processing, loss of monitoring visibility, or denial of service. This issue is fixed in version 8.0.6.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, the HTTP/1 parser limits decompression work per transaction but does not limit how many small brotli compression bombs a single flow can submit. With response-body-decompress-layer-limit enabled, repeated compressed responses make the decompression paths in rust/htp perform expensive work for every transaction, degrading packet processing and potentially causing loss of monitoring visibility or denial of service. This issue is fixed in version 8.0.6.

In Suricata from 8.0.0 until 8.0.6, a locally supplied detection rule combining frame inspection without content and a transformed match without content can make src/detect-engine-prefilter.c select multiple non-prefilter frame engines. Loading the crafted rule, including in test mode, can trigger a heap buffer overflow and crash Suricata.

In Suricata prior to 8.0.6, the FTP parser in src/app-layer-ftp.c treats a RETR or STOR command sent before PORT or PASV negotiation as a fatal application-layer error instead of a recoverable protocol event. The fatal state disables FTP parsing for the remainder of the TCP flow, allowing later commands to evade parser-dependent rules and logging; IPS mode instead drops the flow.

Suricata from 8.0.0 to 8.0.6 has a vulnerability in the SIP parser where request and response body lengths are stored in 16-bit fields. A body larger than 65,536 bytes can truncate the length, preventing full frame inspection and allowing evasion of frame-based detection.

Vulnerability in Suricata's SMB parser can retain force-completed transactions on flows with one-directional payload, leading to unbounded per-flow state and CPU/memory exhaustion. Sustained one-directional SMB traffic can be exploited.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.5 until 8.0.6, the FTP parser in src/app-layer-ftp.c can continue allocating transactions after app-layer.protocols.ftp.max-tx is reached while processing one large chunk of FTP command data. The oversized transaction list is repeatedly processed with quadratic complexity after the too_many_transactions event, allowing crafted FTP traffic to degrade packet processing, reduce monitoring visibility, or cause denial of service. This issue is fixed in version 8.0.6.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 8.0.0 until 8.0.6, AppLayerParserSetTransactionInspectId() in src/app-layer-parser.c uses an inverted guard and marks only already-inspected transactions as inspected. On flows passed by a pass rule or pass-the-flow exception policy, detection is skipped, so completed transactions remain unmarked, are never freed, and are repeatedly rescanned. The per-flow list can grow without bound with quadratic cleanup cost, causing CPU and memory exhaustion. This issue is fixed in version 8.0.6.

Vulnerability in Suricata's SMTP MIME parser does not fully reset state when processing Content-Type: message/rfc822 encapsulation, allowing crafted mail to evade detections based on file.data, file.name, or extracted URLs.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 7.0.13 until 7.0.17, the SMTP MIME quoted-printable decoder in src/util-decode-mime.c can read one byte past a heap buffer when a quoted-printable escape sequence is split across traffic chunks and the following chunk contains exactly one byte. Crafted SMTP traffic can trigger the out-of-bounds read and crash Suricata when decode-quoted-printable MIME decoding is enabled. This issue is fixed in version 7.0.17.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From 7.0.0 until 7.0.17 and 8.0.6, the MQTT parser in rust/src/mqtt/mqtt.rs permits repeated PUBREC or PUBREL messages to be appended to one transaction without a limit. Crafted MQTT traffic can grow transaction state indefinitely, consuming CPU and memory and causing slowdown or denial of service. This issue is fixed in versions 8.0.6 and 7.0.17.

Suricata from 8.0.0 to 8.0.6 has a vulnerability in src/datasets-context-json.c where it assumes that a configured JSON or NDJSON dataset value_key resolves to a string. A non-string value for that key can cause a NULL pointer dereference during startup, configuration test mode, or rule reload, crashing Suricata before traffic processing.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to 7.0.17 and 8.0.6, the Windows service installation and parameter-update logic in src/win32-service.c can pass an unquoted service ImagePath to CreateServiceA. When Suricata is installed below a path containing spaces and an earlier path component is writable by a local low-privileged attacker, Windows can execute an attacker-controlled program as LocalSystem, resulting in local privilege escalation. This issue is fixed in versions 8.0.6 and 7.0.17.

Suricata prior to 7.0.17 and 8.0.6 has a vulnerability in HTTP SWF decompression when the non-default swf-decompression feature and an unsafe decompress-depth are used. The allocation can use the configured depth instead of limiting to the Flash file's actual data requirement, leading to an integer-related heap buffer overflow and crash of Suricata.

Suricata versions 8.0.0 through 8.0.6 have a vulnerability in the DHCP and RDP parsers where stateless transactions are created without recording packet direction with AppLayerTxData::for_direction(). A sensor observing only one direction cannot mark the unseen direction inspected or free completed transactions, causing the per-flow transaction list to grow without bound.

Suricata prior to versions 7.0.17 and 8.0.6 has a vulnerability in src/ippair.c where crafted IPv4 and IPv6 address pairs can collide in the IPPair hash because the IP address family was not compared before reusing IPPair-backed state. This can apply state from one IP family to another for xbits track ip_pair, FTP data expectations, and, on the 7.0 release line, thresholding, detection_filter, and rate_filter rules using track by_both.

Suricata (network IDS/IPS and security monitoring engine) versions 8.0.0 through before 8.0.5 can deadlock in its IP defragmentation code when processing fragmented traffic containing an encapsulated tunnel protocol whose payload is itself fragmented. Version 8.0.5 contains a fix.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From version 8.0.0 to 8.0.5, a Lua rule that registers too many flow variables can corrupt Lua detection state and may bypass Suricata's restricted Lua sandbox. This requires an affected Lua script or rule to be loaded.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, IKEv2 parser state could grow without bounds while storing client transforms. Repeated crafted UDP traffic may cause Suricata to consume excessive memory.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. From version 8.0.0 to 8.0.5, LDAP transaction state could store an unbounded number of responses. Because LDAP can be processed over UDP, crafted traffic may cause Suricata to consume excessive memory.

Suricata, a network IDS/IPS and security monitoring engine, prior to versions 7.0.16 and 8.0.5 allows a malicious rule to potentially overwrite any file on the file system on rule load or reload. Versions 7.0.16 and 8.0.5 fix the issue. Workarounds include preprocessing load+save rules to disallow absolute filenames for save, using Suricata's privilege dropping to limit writable files, and/or configuring landlock in suricata.yaml.

In Suricata prior to versions 7.0.16 and 8.0.5, certain NFS parser state structures were insufficiently bounded. Crafted NFS traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service.

In Suricata prior to versions 7.0.16 and 8.0.5, DNP3 reassembly could buffer data without sufficient parser-level bounds. Crafted DNP3 traffic may cause Suricata to consume excessive memory, potentially resulting in denial of service.

In Suricata prior to versions 7.0.16 and 8.0.5, the IP defragmentation tracker lookup did not verify that an existing tracker used the same IP address family as the packet being processed. Under crafted fragmented IPv4/IPv6 traffic, an IPv6 fragment could be associated with an IPv4 defragmentation tracker, leading to a remote packet-triggered crash and denial of service.

Suricata versions prior to 7.0.16 and 8.0.5 contain a heap buffer overflow when loading signatures. A crafted rule using mixed-case frame syntax can trigger the overflow during rule parsing/loading rather than by network traffic alone.

In Suricata prior to versions 7.0.16 and 8.0.5, Suricata could repeatedly perform expensive parsing of large HTTP Content-Disposition headers during HTTP response body processing. Crafted HTTP traffic could cause excessive CPU usage and denial of service.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Starting in version 8.0.0 and prior to version 8.0.5, when certain detection transforms are chained, the decompress transform pipeline could read from an inspection buffer after it had been reallocated and freed. The issue is reached during network traffic processing, but requires a malicious rule as Suricata will crash whatever the traffic.

Suricata is a network Intrusion Detection System, Intrusion Prevention System and Network Security Monitoring engine. Prior to versions 7.0.16 and 8.0.5, Suricata's inspection-buffer helper could leave an inspection pointer referencing freed memory after a chained transform caused the backing buffer to be reallocated. The issue is reached during a specific network traffic processing, and requires a specific but not malicious rule.

Suricata is a network IDS, IPS, and network security monitoring engine. Prior to versions 7.0.16 and 8.0.5, Suricata's HTTP/2 decompression path could grow the decompressed response-body buffer without an effective upper bound. A crafted HTTP/2 DATA payload using a high compression ratio (e.g., gzip, deflate, brotli) could cause excessive memory allocation during decompression.

Suricata is a network IDS, IPS, and network security monitoring engine. Prior to version 7.0.16, the Lua TLS certificate information helper could dereference NULL certificate fields when a Lua script requested certificate information for TLS traffic where some certificate fields were absent. Crafted TLS traffic processed by a deployment using affected Lua TLS scripting could crash Suricata, resulting in denial of service.

Suricata is a network Intrusion Detection System, Intrusion Prevention System, and Network Security Monitoring engine. Starting in version 8.0.0 and prior to version 8.0.5, when Lua rule execution is enabled, the Lua sandbox memory limit was not consistently enforced for new allocations. Certain Lua allocation patterns could exceed security.lua.max-bytes without triggering the intended memory limit, making the configured sandbox limit unreliable. This requires Lua rules to be enabled and an affected Lua script/rule to be loaded.

A vulnerability in the suricata package for openSUSE Tumbleweed allows the suricata user to escalate privileges to root by following a UNIX symbolic link.

Suricata version 8.0.0 has a bug in the usage of the tls.subjectaltname keyword that can lead to a segmentation fault when the decoded subjectaltname contains a NULL byte. This issue is fixed in version 8.0.1. A workaround is to disable rules using the tls.subjectaltname keyword.

In Suricata version 8.0.0, rules using the keyword ldap.responses.attribute_type (which is long) with transforms can lead to a stack buffer overflow during startup or rule reload. This issue is fixed in version 8.0.1. Workaround is to disable rules with this keyword and transforms.

Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. Versions 8.0.0 and below incorrectly handle the entropy keyword when not anchored to a "sticky" buffer, which can lead to a segmentation fault. This issue is fixed in version 8.0.1. To workaround this issue, users can disable rules using the entropy keyword, or validate they are anchored to a sticky buffer.

Suricata versions 7.0.11 and below, as well as 8.0.0, are vulnerable to detection bypass when crafted traffic sends multiple SYN packets with different sequence numbers within the same flow tuple, which can cause Suricata to fail to pick up the TCP session. In IDS mode this can lead to a detection and logging bypass. In IPS mode this will lead to the flow getting blocked.

In Suricata before version 6.0.13, an adversary controlling an external source of rules may exploit a dataset filename to trigger directory traversal, leading to write access to the local filesystem. This issue is addressed in version 6.0.13 by requiring the use of allow-absolute-filenames and allow-write options in the datasets rules configuration section.