lighttpd is vulnerable to denial of service. The vulnerability exists due to a lack of initialization when an invalide HTTP request (websocket handshake) leading to a null pointer dereference allowing an attacker to crash the system.
{"suse": [{"lastseen": "2022-09-29T16:05:23", "description": "An update that fixes one vulnerability is now available.\n\nDescription:\n\n This update for lighttpd fixes the following issues:\n\n lighttpd was updated to 1.4.66:\n\n * a number of bug fixes\n * Fix HTTP/2 downloads >= 4GiB\n * Fix SIGUSR1 graceful restart with TLS\n * futher bug fixes\n * CVE-2022-37797: null pointer dereference in mod_wstunnel, possibly a\n remotely triggerable crash (boo#1203358)\n * In an upcoming release the TLS modules will default to using stronger,\n modern chiphers and will default to allow client preference in selecting\n ciphers. \ufffd\ufffd\ufffdCipherString\ufffd\ufffd\ufffd =>\n \ufffd\ufffd\ufffdEECDH+AESGCM:AES256+EECDH:CHACHA20:SHA256:!SHA384\ufffd\ufffd\ufffd, \ufffd\ufffd\ufffdOptions\ufffd\ufffd\ufffd\n => \ufffd\ufffd\ufffd-ServerPreference\ufffd\ufffd\ufffd\n old defaults: \ufffd\ufffd\ufffdCipherString\ufffd\ufffd\ufffd => \ufffd\ufffd\ufffdHIGH\ufffd\ufffd\ufffd, \ufffd\ufffd\ufffdOptions\ufffd\ufffd\ufffd =>\n \ufffd\ufffd\ufffdServerPreference\ufffd\ufffd\ufffd\n * A number of TLS options are how deprecated and will be removed in a\n future release: \ufffd\ufffd\ufffd ssl.honor-cipher-order \ufffd\ufffd\ufffd ssl.dh-file \ufffd\ufffd\ufffd\n ssl.ec-curve \ufffd\ufffd\ufffd ssl.disable-client-renegotiation \ufffd\ufffd\ufffd ssl.use-sslv2 \ufffd\ufffd\ufffd\n ssl.use-sslv3 The replacement option is ssl.openssl.ssl-conf-cmd, but\n lighttpd defaults should be prefered\n * A number of modules are now deprecated and will be removed in a future\n release: mod_evasive, mod_secdownload, mod_uploadprogress, mod_usertrack\n can be replaced by mod_magnet and a few lines of lua.\n\n update to 1.4.65:\n\n * WebSockets over HTTP/2\n * RFC 8441 Bootstrapping WebSockets with HTTP/2\n * HTTP/2 PRIORITY_UPDATE\n * RFC 9218 Extensible Prioritization Scheme for HTTP\n * prefix/suffix conditions in lighttpd.conf\n * mod_webdav safe partial-PUT\n * webdav.opts += (\ufffd\ufffd\ufffdpartial-put-copy-modify\ufffd\ufffd\ufffd => \ufffd\ufffd\ufffdenable\ufffd\ufffd\ufffd)\n * mod_accesslog option: accesslog.escaping = \ufffd\ufffd\ufffdjson\ufffd\ufffd\ufffd\n * mod_deflate libdeflate build option\n * speed up request body uploads via HTTP/2\n * Behavior Changes\n * change default server.max-keep-alive-requests = 1000 to adjust\n * to increasing HTTP/2 usage and to web2/web3 application usage\n * (prior default was 100)\n * mod_status HTML now includes HTTP/2 control stream id 0 in the output\n * which contains aggregate counts for the HTTP/2 connection\n * (These lines can be identified with URL \ufffd\ufffd\ufffd*\ufffd\ufffd\ufffd, part of \ufffd\ufffd\ufffdPRI *\ufffd\ufffd\ufffd\n preface)\n * alternative: https://wiki.lighttpd.net/ModMagnetExamples#lua-mod_status\n * MIME type application/javascript is translated to text/javascript (RFC\n 9239)\n\n\nPatch Instructions:\n\n To install this openSUSE Security Update use the SUSE recommended installation methods\n like YaST online_update or \"zypper patch\".\n\n Alternatively you can run the command listed for your product:\n\n - openSUSE Backports SLE-15-SP4:\n\n zypper in -t patch openSUSE-2022-10132=1\n\n - openSUSE Backports SLE-15-SP3:\n\n zypper in -t patch openSUSE-2022-10132=1", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2022-09-29T00:00:00", "type": "suse", "title": "Security update for lighttpd (moderate)", "bulletinFamily": "unix", "cvss2": {}, "cvelist": ["CVE-2022-37797"], "modified": "2022-09-29T00:00:00", "id": "OPENSUSE-SU-2022:10132-1", "href": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/ATUOJQDWIRALBMVI5GOSOGPZP5AWVAZF/", "cvss": {"score": 0.0, "vector": "NONE"}}], "cve": [{"lastseen": "2023-06-03T14:54:58", "description": "In lighttpd 1.4.65, mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (websocket handshake) is received. 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It leads to null pointer dereference which crashes the server. It could be used by an external attacker to cause denial of service condition.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2022-09-12T15:15:00", "type": "debiancve", "title": "CVE-2022-37797", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2022-37797"], "modified": "2022-09-12T15:15:00", "id": "DEBIANCVE:CVE-2022-37797", "href": "https://security-tracker.debian.org/tracker/CVE-2022-37797", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "osv": [{"lastseen": "2022-10-03T21:11:07", "description": "\nAn invalid HTTP request (websocket handshake) may cause a `NULL`\npointer dereference in the wstunnel module.\n\n\nFor Debian 10 buster, this problem has been fixed in version\n1.4.53-4+deb10u3.\n\n\nWe recommend that you upgrade your lighttpd packages.\n\n\nFor the detailed security status of lighttpd please refer to\nits security tracker page at:\n<https://security-tracker.debian.org/tracker/lighttpd>\n\n\nFurther information about Debian LTS security advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: <https://wiki.debian.org/LTS>\n\n\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "baseScore": 7.5, "privilegesRequired": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "userInteraction": "NONE", "version": "3.1"}, "impactScore": 3.6}, "published": "2022-10-03T00:00:00", "type": "osv", "title": "lighttpd - security update", "bulletinFamily": "software", "cvss2": {}, "cvelist": ["CVE-2022-37797"], "modified": "2022-10-03T21:11:04", "id": "OSV:DLA-3133-1", "href": "https://osv.dev/vulnerability/DLA-3133-1", "cvss": {"score": 0.0, "vector": "NONE"}}, {"lastseen": "2023-06-28T06:51:14", "description": "\nSeveral vulnerabilities were discovered in lighttpd, a fast webserver\nwith minimal memory footprint.\n\n\n* [CVE-2022-37797](https://security-tracker.debian.org/tracker/CVE-2022-37797)\nAn invalid HTTP request (websocket handshake) may cause a NULL\n pointer dereference in the wstunnel module.\n* [CVE-2022-41556](https://security-tracker.debian.org/tracker/CVE-2022-41556)\nA resource leak in mod\\_fastcgi and mod\\_scgi could lead to a denial\n of service after a large number of bad HTTP requests.\n\n\nFor the stable distribution (bullseye), these problems have been fixed in\nversion 1.4.59-1+deb11u2.\n\n\nWe recommend that you upgrade your lighttpd packages.\n\n\nFor the detailed security status of lighttpd please refer to its\nsecurity tracker page at:\n[\\\nhttps://security-tracker.debian.org/tracker/lighttpd](https://security-tracker.debian.org/tracker/lighttpd)\n\n\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2022-09-28T00:00:00", "type": "osv", "title": "lighttpd - security update", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2022-37797", "CVE-2022-41556"], "modified": "2023-06-28T06:50:30", "id": "OSV:DSA-5243-1", "href": "https://osv.dev/vulnerability/DSA-5243-1", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "amazon": [{"lastseen": "2023-06-03T14:58:02", "description": "**Issue Overview:**\n\nIn lighttpd 1.4.65, mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (websocket handshake) is received. It leads to null pointer dereference which crashes the server. It could be used by an external attacker to cause denial of service condition. (CVE-2022-37797)\n\n \n**Affected Packages:** \n\n\nlighttpd\n\n \n**Issue Correction:** \nRun _yum update lighttpd_ to update your system. \n\n\n \n\n\n**New Packages:**\n \n \n i686: \n \u00a0\u00a0\u00a0 lighttpd-mod_authn_gssapi-1.4.53-1.37.amzn1.i686 \n \u00a0\u00a0\u00a0 lighttpd-debuginfo-1.4.53-1.37.amzn1.i686 \n \u00a0\u00a0\u00a0 lighttpd-fastcgi-1.4.53-1.37.amzn1.i686 \n \u00a0\u00a0\u00a0 lighttpd-mod_mysql_vhost-1.4.53-1.37.amzn1.i686 \n \u00a0\u00a0\u00a0 lighttpd-1.4.53-1.37.amzn1.i686 \n \u00a0\u00a0\u00a0 lighttpd-mod_authn_mysql-1.4.53-1.37.amzn1.i686 \n \u00a0\u00a0\u00a0 lighttpd-mod_geoip-1.4.53-1.37.amzn1.i686 \n \u00a0\u00a0\u00a0 lighttpd-mod_authn_pam-1.4.53-1.37.amzn1.i686 \n \n src: \n \u00a0\u00a0\u00a0 lighttpd-1.4.53-1.37.amzn1.src \n \n x86_64: \n \u00a0\u00a0\u00a0 lighttpd-fastcgi-1.4.53-1.37.amzn1.x86_64 \n \u00a0\u00a0\u00a0 lighttpd-mod_authn_mysql-1.4.53-1.37.amzn1.x86_64 \n \u00a0\u00a0\u00a0 lighttpd-mod_geoip-1.4.53-1.37.amzn1.x86_64 \n \u00a0\u00a0\u00a0 lighttpd-mod_authn_gssapi-1.4.53-1.37.amzn1.x86_64 \n \u00a0\u00a0\u00a0 lighttpd-mod_authn_pam-1.4.53-1.37.amzn1.x86_64 \n \u00a0\u00a0\u00a0 lighttpd-mod_mysql_vhost-1.4.53-1.37.amzn1.x86_64 \n \u00a0\u00a0\u00a0 lighttpd-debuginfo-1.4.53-1.37.amzn1.x86_64 \n \u00a0\u00a0\u00a0 lighttpd-1.4.53-1.37.amzn1.x86_64 \n \n \n\n### Additional References\n\nRed Hat: [CVE-2022-37797](<https://access.redhat.com/security/cve/CVE-2022-37797>)\n\nMitre: [CVE-2022-37797](<https://vulners.com/cve/CVE-2022-37797>)\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2023-03-17T15:53:00", "type": "amazon", "title": "Important: lighttpd", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2022-37797"], "modified": "2023-03-22T18:51:00", "id": "ALAS-2023-1705", "href": "https://alas.aws.amazon.com/ALAS-2023-1705.html", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "redos": [{"lastseen": "2023-09-08T14:27:37", "description": "Vulnerability of lighttpd web server is related to a null pointer dereferencing error in mod_wstunnel module\r\n module when processing invalid HTTP requests. Exploitation of the vulnerability could allow an attacker,\r\n remotely, send specially crafted HTTP requests to a vulnerable web server and execute a denial of service attack.\r\n A denial of service (DoS) attack", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2022-10-04T00:00:00", "type": "redos", "title": "ROS-20221004-02", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2022-37797"], "modified": "2022-10-04T00:00:00", "id": "ROS-20221004-02", "href": "https://redos.red-soft.ru/support/secure/uyazvimosti/uyazvimost-lighttpd-cve-2022-37797/", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "mageia": [{"lastseen": "2023-06-03T15:12:48", "description": "In lighttpd 1.4.65, mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (websocket handshake) is received. It leads to null pointer dereference which crashes the server. It could be used by an external attacker to cause denial of service condition. (CVE-2022-37797) A resource leak in mod_fastcgi and mod_scgi could lead to a denial of service after a large number of bad HTTP requests. (CVE-2022-41556) \n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2022-10-13T20:05:19", "type": "mageia", "title": "Updated lighttpd packages fix security vulnerability\n", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2022-37797", "CVE-2022-41556"], "modified": "2022-10-13T20:05:19", "id": "MGASA-2022-0369", "href": "https://advisories.mageia.org/MGASA-2022-0369.html", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "gentoo": [{"lastseen": "2023-06-03T15:07:29", "description": "### Background\n\nLighttpd is a lightweight high-performance web server.\n\n### Description\n\nLighttpd's mod_wstunnel does not initialize a handler function pointer if an invalid HTTP request (websocket handshake) is received.\n\n### Impact\n\nAn attacker can trigger a denial of service via making Lighttpd try to call an uninitialized function pointer.\n\n### Workaround\n\nThere is no known workaround at this time.\n\n### Resolution\n\nAll lighttpd users should upgrade to the latest version:\n \n \n # emerge --sync\n # emerge --ask --oneshot --verbose \">=www-servers/lighttpd-1.4.67\"", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "HIGH", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 3.6}, "published": "2022-10-31T00:00:00", "type": "gentoo", "title": "Lighttpd: Denial of Service", "bulletinFamily": "unix", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 5.0, "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0", "accessVector": "NETWORK", "authentication": "NONE"}, "impactScore": 2.9, "acInsufInfo": false, "obtainUserPrivilege": false}, "cvelist": ["CVE-2022-37797", "CVE-2022-41556"], "modified": "2022-10-31T00:00:00", "id": "GLSA-202210-12", "href": "https://security.gentoo.org/glsa/202210-12", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}]}
Denial Of Service (DoS)
