In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines after a command.
{"hackerone": [{"lastseen": "2022-10-09T13:20:05", "bounty": 500.0, "description": "Function `smtp_server_connection_handle_command` in src/lib-smtp/smtp-server-connection.c creates a variable named cmd with\n`cmd = smtp_server_command_new(tmp_conn, cmd_name, cmd_params);`\nIt gets used with `return (cmd == NULL || !cmd->input_locked);` ie `cmd->input_locked` dereferences the pointer \nBut we can get to this code with cmd != NULL and cmd was freed\n\nTo do so, we can trigger in `smtp_server_command_submit_reply` the condition\n`if (conn != NULL && conn->bad_counter > conn->set.max_bad_commands) {` which calls `smtp_server_connection_terminate` which ends up freeing cmd (`smtp_server_connection_close`, `smtp_server_connection_disconnect`, `smtp_server_command_unref`)\nTo do so, it is enough do send enough linefeeds characters like \"\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\\n\" to the server.\n\nTo me the flawed logic is to have the check `if (!smtp_server_connection_unref(&tmp_conn)) {`\nThis decreases reference count only once, which has been increased before at least twice in `smtp_server_connection_handle_command` and its caller `smtp_server_connection_input`\n\nProposed patch is\n```\ndiff --git a/src/lib-smtp/smtp-server-connection.c b/src/lib-smtp/smtp-server-connection.c\nindex 404acc888b..ab8746fb2b 100644\n--- a/src/lib-smtp/smtp-server-connection.c\n+++ b/src/lib-smtp/smtp-server-connection.c\n@@ -295,8 +295,10 @@ smtp_server_connection_handle_command(struct smtp_server_connection *conn,\n struct smtp_server_command *cmd;\n \n smtp_server_connection_ref(tmp_conn);\n+ int refcount = tmp_conn->refcount;\n cmd = smtp_server_command_new(tmp_conn, cmd_name, cmd_params);\n- if (!smtp_server_connection_unref(&tmp_conn)) {\n+ if (refcount > tmp_conn->refcount ||\n+ !smtp_server_connection_unref(&tmp_conn)) {\n /* the command start callback managed to get this connection\n destroyed */\n return FALSE;\n```\n\nThis was found by fuzzing\n\n## Impact\n\nThe attacker can use this as a denial of service against the SMTP server.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2020-03-23T10:54:20", "type": "hackerone", "title": "Open-Xchange: Use after free in smtp_server_connection_handle_command", "bulletinFamily": "bugbounty", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": "PARTIAL", "integrityImpact": "NONE", "baseScore": 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"description": "In Dovecot before 2.3.10.1, a crafted SMTP/LMTP message triggers an unauthenticated use-after-free bug in submission-login, submission, or lmtp, and can lead to a crash under circumstances involving many newlines after a command.", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2020-05-18T14:15:00", "type": "debiancve", "title": "CVE-2020-10958", "bulletinFamily": "info", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": 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A malicious SMTP/LMTP message triggers an unauthenticated use-after-free bug in submission-login, submission, or lmtp, and can lead to a crash under when there are multiple newlines after a command.\n", "cvss3": {"exploitabilityScore": 3.9, "cvssV3": {"baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "attackComplexity": "LOW", "scope": "UNCHANGED", "attackVector": "NETWORK", "availabilityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1", "userInteraction": "NONE"}, "impactScore": 1.4}, "published": "2020-08-06T21:34:15", "type": "veracode", "title": "Denial Of Service (DoS)", "bulletinFamily": "software", "cvss2": {"severity": "MEDIUM", "exploitabilityScore": 10.0, "obtainAllPrivilege": false, "userInteractionRequired": false, "obtainOtherPrivilege": false, "cvssV2": {"accessComplexity": "LOW", "confidentialityImpact": "NONE", "availabilityImpact": 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Reliable way to \ncrash has not yet been discovered. \n \nSolution: \n \nUpgrade to fixed version. \n \n------------------ \n \nOpen-Xchange Security Advisory 2020-05-18 \n \nProduct: Dovecot \nVendor: OX Software GmbH \n \nInternal reference: DOV-1745 \nVulnerability type: Improper input validation (CWE-20) \nVulnerable version: 2.3.0 - 2.3.10 \nVulnerable component: submission, lmtp \nReport confidence: Confirmed \nSolution status: Fixed by Vendor \nFixed version: 2.3.10.1 \nResearcher credits: mailbox.org \nVendor notification: 2020-03-20 \nSolution date: 2020-04-02 \nPublic disclosure: 2020-05-18 \nCVE reference: CVE-2020-10967 \nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) \n \nVulnerability Details: \nSending mail with empty quoted localpart causes submission or lmtp component \nto crash. \n \nRisk: \nMalicious actor can cause denial of service to mail delivery by repeatedly \nsending mails with bad sender or recipient address. \n \nSteps to reproduce: \nSend mail with envelope sender or recipient as ``<\"\"@example.org>``. \n \nWorkaround: \nFor submission there is no workaround, but triggering the bug requires valid \ncredentials. \nFor lmtp, one can implement sufficient filtering on MTA level to prevent mails \nwith such addresses from ending up in LMTP delivery. \n \nSolution: \nUpgrade to fixed version. \n \n------------------ \n`\n", "cvss": {"score": 0.0, "vector": "NONE"}, "sourceHref": "https://packetstormsecurity.com/files/download/157771/oxdovecot-nullpointerdos.txt"}], "debian": [{"lastseen": "2023-07-04T15:07:54", "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-4690-1 security@debian.org\nhttps://www.debian.org/security/ Salvatore Bonaccorso\nMay 20, 2020 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : dovecot\nCVE ID : CVE-2020-10957 CVE-2020-10958 CVE-2020-10967\nDebian Bug : 960963\n\nSeveral vulnerabilities were discovered in the Dovecot email server,\nwhich could cause crashes in the submission, submission-login or lmtp\nservices, resulting in denial of service.\n\nFor the stable distribution (buster), these problems have been fixed in\nversion 1:2.3.4.1-5+deb10u2.\n\nWe recommend that you upgrade your dovecot packages.\n\nFor the detailed security status of dovecot please refer to its security\ntracker page at:\nhttps://security-tracker.debian.org/tracker/dovecot\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org", "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": "2020-05-20T19:49:21", "type": "debian", "title": "[SECURITY] [DSA 4690-1] dovecot security update", "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-2020-10957", "CVE-2020-10958", "CVE-2020-10967"], "modified": "2020-05-20T19:49:21", "id": "DEBIAN:DSA-4690-1:11B6F", "href": "https://lists.debian.org/debian-security-announce/2020/msg00094.html", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}, {"lastseen": "2021-10-22T02:30:08", "description": "- -------------------------------------------------------------------------\nDebian Security Advisory DSA-4690-1 security@debian.org\nhttps://www.debian.org/security/ Salvatore Bonaccorso\nMay 20, 2020 https://www.debian.org/security/faq\n- -------------------------------------------------------------------------\n\nPackage : dovecot\nCVE ID : CVE-2020-10957 CVE-2020-10958 CVE-2020-10967\nDebian Bug : 960963\n\nSeveral vulnerabilities were discovered in the Dovecot email server,\nwhich could cause crashes in the submission, submission-login or lmtp\nservices, resulting in denial of service.\n\nFor the stable distribution (buster), these problems have been fixed in\nversion 1:2.3.4.1-5+deb10u2.\n\nWe recommend that you upgrade your dovecot packages.\n\nFor the detailed security status of dovecot please refer to its security\ntracker page at:\nhttps://security-tracker.debian.org/tracker/dovecot\n\nFurther information about Debian Security Advisories, how to apply\nthese updates to your system and frequently asked questions can be\nfound at: https://www.debian.org/security/\n\nMailing list: debian-security-announce@lists.debian.org", "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": "2020-05-20T19:49:21", "type": "debian", "title": "[SECURITY] [DSA 4690-1] dovecot security update", "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"}, "acInsufInfo": false, "impactScore": 2.9, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-10957", "CVE-2020-10958", "CVE-2020-10967"], "modified": "2020-05-20T19:49:21", "id": "DEBIAN:DSA-4690-1:2BAC1", "href": "https://lists.debian.org/debian-security-announce/2020/msg00094.html", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "archlinux": [{"lastseen": "2023-06-06T15:10:28", "description": "Arch Linux Security Advisory ASA-202005-9\n=========================================\n\nSeverity: High\nDate : 2020-05-19\nCVE-ID : CVE-2020-10957 CVE-2020-10958 CVE-2020-10967\nPackage : dovecot\nType : multiple issues\nRemote : Yes\nLink : https://security.archlinux.org/AVG-1162\n\nSummary\n=======\n\nThe package dovecot before version 2.3.10.1-1 is vulnerable to multiple\nissues including arbitrary code execution and denial of service.\n\nResolution\n==========\n\nUpgrade to 2.3.10.1-1.\n\n# pacman -Syu \"dovecot>=2.3.10.1-1\"\n\nThe problems have been fixed upstream in version 2.3.10.1.\n\nWorkaround\n==========\n\nNone.\n\nDescription\n===========\n\n- CVE-2020-10957 (denial of service)\n\nA NULL-pointer dereference issue has been found in Dovecot before\n2.3.10.1 in the lmtp/submission component. A client can crash the\nserver by sending a NOOP command with an invalid string parameter. This\noccurs particularly for a parameter that doesn't start with a double\nquote. This applies to all SMTP services, including submission-login,\nwhich makes it possible to crash the submission service without\nauthentication.\n\n- CVE-2020-10958 (arbitrary code execution)\n\nA security issue has been found in Dovecot before 2.3.10.1 in the\nlmtp/submission component. Sending many invalid or unknown commands can\ncause the server to access freed memory, which can lead to a server\ncrash. This happens when the server closes the connection with a \"421\nToo many invalid commands\" error. The bad command limit depends on the\nservice (lmtp or submission) and varies between 10 to 20 bad commands.\n\n- CVE-2020-10967 (denial of service)\n\nA security issue has been found in Dovecot before 2.3.10.1 in the\nlmtp/submission component. An authenticated attacker could send an\ne-mail via the submission service with empty quoted localpart which\nwould cause the submission or lmtp component to crash. An\nunauthenticated attacker could send an e-mail with a bad sender or\nrecipient address, causing the e-mail to be passed to LMTP for delivery\nand then crash the LMTP component unless some kind of filtering has\nbeen set up on the MTA level.\n\nImpact\n======\n\nA remote, unauthenticated attacker can crash the server, causing a\ndenial of service. Under certain circumstances it might be possible for\na remote attacker to execute arbitrary code on the affected host.\n\nReferences\n==========\n\nhttps://dovecot.org/pipermail/dovecot-news/2020-May/000437.html\nhttps://dovecot.org/pipermail/dovecot-news/2020-May/000438.html\nhttps://github.com/dovecot/core/commit/d143ca6b7ee1196ae3eafffbf6dee71a95a5e0b8\nhttps://github.com/dovecot/core/commit/606724bd528b92347dce580d3ab48fc1e3c2f4d7\nhttps://github.com/dovecot/core/commit/aedb205c79395de77127fb7166b29b09319df23c\nhttps://github.com/dovecot/core/commit/874817b169d19a4ae51d80ad5798a396bfe90136\nhttps://github.com/dovecot/core/commit/5efeccc10beccbf8d7700adec1278f97d416cbc6\nhttps://github.com/dovecot/core/commit/2b4f1e47a4ca8a192bf3f7e944c0ad07b21b2ed1\nhttps://github.com/dovecot/core/commit/563bf21d8228a3c06c63b3f289a90ca3d0c579a4\nhttps://github.com/dovecot/core/commit/18d5837748d3eafe56e080653d5ed0b3e221be0b\nhttps://github.com/dovecot/core/commit/063462d588eaea6f266596fae5f5470792dcc98d\nhttps://github.com/dovecot/core/commit/b34002a4ca301ed94cd944ee3504287ed7e58031\nhttps://github.com/dovecot/core/commit/92d9690da195b6ceaa878ab1df6c7c31a75f63f8\nhttps://github.com/dovecot/core/commit/cbab48f174580bfb8d49321d8d336f96a231b0cd\nhttps://security.archlinux.org/CVE-2020-10957\nhttps://security.archlinux.org/CVE-2020-10958\nhttps://security.archlinux.org/CVE-2020-10967", "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": "2020-05-19T00:00:00", "type": "archlinux", "title": "[ASA-202005-9] dovecot: multiple issues", "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-2020-10957", "CVE-2020-10958", "CVE-2020-10967"], "modified": "2020-05-19T00:00:00", "id": "ASA-202005-9", "href": "https://security.archlinux.org/ASA-202005-9", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "altlinux": [{"lastseen": "2023-03-31T19:17:25", "description": "2.3.10.1-alt1 built May 21, 2020 Gleb Fotengauer-Malinovskiy in task #252013\n\nMay 20, 2020 Gleb Fotengauer-Malinovskiy\n \n \n - Updated to 2.3.10.1 (fixes CVE-2020-10957, CVE-2020-10958, CVE-2020-10967).\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": "2020-05-21T00:00:00", "type": "altlinux", "title": "Security fix for the ALT Linux 9 package dovecot version 2.3.10.1-alt1", "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-2020-10957", "CVE-2020-10958", "CVE-2020-10967"], "modified": "2020-05-21T00:00:00", "id": "6A36B1050B6D8B79D32BD6ED20F58BFC", "href": "https://packages.altlinux.org/en/p9/srpms/dovecot/", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "zdt": [{"lastseen": "2023-06-06T17:19:27", "description": "", "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": "2020-05-18T00:00:00", "type": "zdt", "title": "Open-Xchange Dovecot 2.3.10 Null Pointer Dereference / Denial Of Service Vulnerabilities", "bulletinFamily": "exploit", "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-2020-10957", "CVE-2020-10958", "CVE-2020-10967"], "modified": "2020-05-18T00:00:00", "id": "1337DAY-ID-34459", "href": "https://0day.today/exploit/description/34459", "sourceData": "------------------\n\nOpen-Xchange Security Advisory 2020-05-18\n\nProduct: Dovecot\nVendor: OX Software GmbH\n\nInternal reference: DOV-3784\nVulnerability type: NULL pointer dereference (CWE-476)\nVulnerable version: 2.3.0 - 2.3.10\nVulnerable component: submission, lmtp\nReport confidence: Confirmed\nSolution status: Fixed by Vendor\nFixed version: 2.3.10.1\nResearcher credits: Philippe Antoine (Catena Cyber)\nVendor notification: 2020-03-24\nSolution date: 2020-04-02\nPublic disclosure: 2020-05-18\nCVE reference: CVE-2020-10957\nCVSS: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)\n\nVulnerability Details:\n Sending malformed NOOP command causes crash in submission, submission-login or\n lmtp service.\n\nRisk:\n Remote attacker can keep submission-login service down, causing denial of\n service attack. For lmtp the risk is neglible, as lmtp is usually behind a\n trusted MTA.\n\nSteps to reproduce:\n Send ``NOOP EE\"FY`` to submission port, or similarly malformed command.\n\nSolution:\n Upgrade to fixed version.\n\n------------------\n\nOpen-Xchange Security Advisory 2020-05-18\n\nProduct: Dovecot IMAP server\nVendor: OX Software GmbH\n\nInternal reference: DOV-3875\nVulnerability type: Improper handling of input data (CWE-20)\nVulnerable version: 2.3.0 - 2.3.10\nVulnerable component: submission, lmtp\nReport confidence: Confirmed\nSolution status: Fixed by Vendor\nFixed version: 2.3.10.1\nResearcher credits: Philippe Antoine (Catena Cyber)\nVendor notification: 2020-03-23\nSolution date: 2020-04-02\nPublic disclosure: 2020-05-18\nCVE reference: CVE-2020-10958\nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)\n\nVulnerability Details:\n\n Sending command followed by sufficient number of newlines triggers a\n use-after-free bug that might crash submission-login, submission or\n lmtp service.\n\nRisk:\n\n Remote attacker can keep submission-login service down, causing denial\n of service attack. For lmtp the risk is neglible, as lmtp is usually\n behind a trusted MTA.\n\nSteps to reproduce:\n\n This can be currently reproduced with ASAN or Valgrind. Reliable way to\n crash has not yet been discovered.\n\nSolution:\n\n Upgrade to fixed version.\n\n------------------\n\nOpen-Xchange Security Advisory 2020-05-18\n\nProduct: Dovecot\nVendor: OX Software GmbH\n\nInternal reference: DOV-1745\nVulnerability type: Improper input validation (CWE-20)\nVulnerable version: 2.3.0 - 2.3.10\nVulnerable component: submission, lmtp\nReport confidence: Confirmed\nSolution status: Fixed by Vendor\nFixed version: 2.3.10.1\nResearcher credits: mailbox.org\nVendor notification: 2020-03-20\nSolution date: 2020-04-02\nPublic disclosure: 2020-05-18\nCVE reference: CVE-2020-10967\nCVSS: 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)\n\nVulnerability Details:\n Sending mail with empty quoted localpart causes submission or lmtp component\n to crash.\n\nRisk:\n Malicious actor can cause denial of service to mail delivery by repeatedly\n sending mails with bad sender or recipient address.\n\nSteps to reproduce:\n Send mail with envelope sender or recipient as ``<\"\"@example.org>``.\n\nWorkaround:\n For submission there is no workaround, but triggering the bug requires valid\n credentials.\n For lmtp, one can implement sufficient filtering on MTA level to prevent mails\n with such addresses from ending up in LMTP delivery.\n\nSolution:\n Upgrade to fixed version.\n\n------------------\n", "sourceHref": "https://0day.today/exploit/34459", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "ubuntu": [{"lastseen": "2023-07-24T23:58:32", "description": "## Releases\n\n * Ubuntu 20.04 LTS\n * Ubuntu 19.10 \n\n## Packages\n\n * dovecot \\- IMAP and POP3 email server\n\nPhilippe Antoine discovered that Dovecot incorrectly handled certain data. \nAn attacker could possibly use this issue to cause a denial of service. \n(CVE-2020-10957, CVE-2020-10967)\n\nPhilippe Antoine discovered that Dovecot incorrectly handled certain data. \nAn attacker could possibly use this issue to cause a denial of service or execute \narbitrary code. (CVE-2020-10958)\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": "2020-05-18T00:00:00", "type": "ubuntu", "title": "Dovecot vulnerabilities", "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-2020-10957", "CVE-2020-10958", "CVE-2020-10967"], "modified": "2020-05-18T00:00:00", "id": "USN-4361-1", "href": "https://ubuntu.com/security/notices/USN-4361-1", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}], "oraclelinux": [{"lastseen": "2021-07-28T14:24:29", "description": "[1:2.3.8-4]\n- fix CVE-2020-12100 resource exhaustion via deeply nested MIME parts (#1866756)\n- fix CVE-2020-12673 out of bound reads in dovecot NTLM implementation (#1866761)\n- fix CVE-2020-12674 crash due to assert in RPA implementation (#1866768)\n[1:2.3.8-3]\n- fix CVE-2020-10957 dovecot: malformed NOOP commands leads to DoS (#1840354)\n- fix CVE-2020-10958 dovecot: command followed by sufficient number of newlines\n leads to use-after-free (#1840357)\n- fix CVE-2020-10967 dovecot: sending mail with empty quoted localpart\n leads to DoS (#1840356)", "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": "2020-11-10T00:00:00", "type": "oraclelinux", "title": "dovecot security update", "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"}, "acInsufInfo": false, "impactScore": 2.9, "obtainUserPrivilege": false}, "cvelist": ["CVE-2020-10957", "CVE-2020-10958", "CVE-2020-10967", "CVE-2020-12100", "CVE-2020-12673", "CVE-2020-12674"], "modified": "2020-11-10T00:00:00", "id": "ELSA-2020-4763", "href": "http://linux.oracle.com/errata/ELSA-2020-4763.html", "cvss": {"score": 5.0, "vector": "AV:N/AC:L/Au:N/C:N/I:N/A:P"}}]}
CVE-2020-10958
