All the vulnerabilites related to wietse_venema - postfix
Vulnerability from fkie_nvd
Published
2005-05-02 04:00
Modified
2024-11-20 23:54
Severity ?
Summary
Postfix 2.1.3, when /proc/net/if_inet6 is not available and permit_mx_backup is enabled in smtpd_recipient_restrictions, allows remote attackers to bypass e-mail restrictions and perform mail relaying by sending mail to an IPv6 hostname.
References
Impacted products
Vendor | Product | Version | |
---|---|---|---|
wietse_venema | postfix | 2.1.3 | |
redhat | enterprise_linux | 4.0 | |
redhat | enterprise_linux | 4.0 | |
redhat | enterprise_linux | 4.0 | |
redhat | enterprise_linux_desktop | 4.0 | |
suse | suse_linux | 8.0 | |
suse | suse_linux | 8.0 | |
suse | suse_linux | 8.1 | |
suse | suse_linux | 8.2 | |
suse | suse_linux | 9.0 | |
suse | suse_linux | 9.0 | |
suse | suse_linux | 9.1 | |
suse | suse_linux | 9.2 |
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Vulnerability from fkie_nvd
Published
2003-08-27 04:00
Modified
2024-11-20 23:44
Severity ?
Summary
The address parser code in Postfix 1.1.12 and earlier allows remote attackers to cause a denial of service (lock) via (1) a malformed envelope address to a local host that would generate a bounce and contains the ".!" string in the MAIL FROM or Errors-To headers, which causes nqmgr to lock up, or (2) via a valid MAIL FROM with a RCPT TO containing a ".!" string, which causes an instance of the SMTP listener to lock up.
References
Impacted products
Vendor | Product | Version | |
---|---|---|---|
wietse_venema | postfix | 1.0.21 | |
wietse_venema | postfix | 1.1.11 | |
wietse_venema | postfix | 1.1.12 | |
wietse_venema | postfix | 1999-09-06 | |
wietse_venema | postfix | 1999-12-31 | |
wietse_venema | postfix | 2000-02-28 | |
wietse_venema | postfix | 2001-11-15 | |
conectiva | linux | 7.0 | |
conectiva | linux | 8.0 |
{ "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:wietse_venema:postfix:1.0.21:*:*:*:*:*:*:*", "matchCriteriaId": "F8C70650-45F8-42F1-863E-C14CFD27986D", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:1.1.11:*:*:*:*:*:*:*", "matchCriteriaId": "6886742C-C8CF-4DE8-812C-30CB19984329", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:1.1.12:*:*:*:*:*:*:*", "matchCriteriaId": "560E65A3-1583-45D5-AAB4-352E09B74C21", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:1999-09-06:*:*:*:*:*:*:*", "matchCriteriaId": "D8F498EC-BAB8-44E9-A1E9-F5FE59D969E7", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:1999-12-31:*:*:*:*:*:*:*", "matchCriteriaId": "3AC09670-77D3-40B7-BD0A-2F447FAB272E", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:2000-02-28:*:*:*:*:*:*:*", "matchCriteriaId": "711ECD8D-66D7-414E-B509-9F10A93FCED8", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:2001-11-15:*:*:*:*:*:*:*", "matchCriteriaId": "0C6E6C91-AE96-481F-92F5-C56F45ABE8E3", "vulnerable": true }, { "criteria": "cpe:2.3:o:conectiva:linux:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "97177EF7-8FC4-4D4D-A8D9-3628AA0035FB", "vulnerable": true }, { "criteria": "cpe:2.3:o:conectiva:linux:8.0:*:*:*:*:*:*:*", "matchCriteriaId": "CD14661C-E3BE-44DF-BC8D-294322BF23EA", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "The address parser code in Postfix 1.1.12 and earlier allows remote attackers to cause a denial of service (lock) via (1) a malformed envelope address to a local host that would generate a bounce and contains the \".!\" string in the MAIL FROM or Errors-To headers, which causes nqmgr to lock up, or (2) via a valid MAIL FROM with a RCPT TO containing a \".!\" string, which causes an instance of the SMTP listener to lock up." }, { "lang": "es", "value": "El c\u00f3digo de procesamiento de direcciones en Postfix 1.1.12 y anteriores permite a atacantes remotos causar una denegaci\u00f3n de servicio (bloqueo) mediante (1) una direcci\u00f3n envoltorio malformada a una m\u00e1quina local que generar\u00eda un rebote y que contenga la cadena \".!\" en las cabeceras MAIL FROM Y Errors-To, lo que hace que nqmgrse cuelge, o (2) mediante un MAIL FROM con un RCPT TO conteniendo una cadena \".!\", lo que hace que una instancia del oyente SMTP se cuelgue." } ], "id": "CVE-2003-0540", "lastModified": "2024-11-20T23:44:58.350", "metrics": { "cvssMetricV2": [ { "acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0" }, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false } ] }, "published": "2003-08-27T04:00:00.000", "references": [ { "source": "cve@mitre.org", "url": "http://distro.conectiva.com.br/atualizacoes/?id=a\u0026anuncio=000717" }, { "source": "cve@mitre.org", "url": "http://lists.grok.org.uk/pipermail/full-disclosure/2003-August/007693.html" }, { "source": "cve@mitre.org", "url": "http://marc.info/?l=bugtraq\u0026m=106001525130257\u0026w=2" }, { "source": "cve@mitre.org", "url": "http://marc.info/?l=bugtraq\u0026m=106029188614704\u0026w=2" }, { "source": "cve@mitre.org", "url": "http://secunia.com/advisories/9433" }, { "source": "cve@mitre.org", "tags": [ "Patch", "Vendor Advisory" ], "url": "http://www.debian.org/security/2003/dsa-363" }, { "source": "cve@mitre.org", "tags": [ "US Government Resource" ], "url": "http://www.kb.cert.org/vuls/id/895508" }, { "source": "cve@mitre.org", "url": "http://www.linuxsecurity.com/advisories/engarde_advisory-3517.html" }, { "source": "cve@mitre.org", "url": "http://www.mandriva.com/security/advisories?name=MDKSA-2003:081" }, { "source": "cve@mitre.org", "url": "http://www.novell.com/linux/security/advisories/2003_033_postfix.html" }, { "source": "cve@mitre.org", "tags": [ "Patch", "Vendor Advisory" ], "url": "http://www.redhat.com/support/errata/RHSA-2003-251.html" }, { "source": "cve@mitre.org", "url": "http://www.securityfocus.com/bid/8333" }, { "source": "cve@mitre.org", "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A544" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://distro.conectiva.com.br/atualizacoes/?id=a\u0026anuncio=000717" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://lists.grok.org.uk/pipermail/full-disclosure/2003-August/007693.html" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://marc.info/?l=bugtraq\u0026m=106001525130257\u0026w=2" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://marc.info/?l=bugtraq\u0026m=106029188614704\u0026w=2" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://secunia.com/advisories/9433" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Patch", "Vendor Advisory" ], "url": "http://www.debian.org/security/2003/dsa-363" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "US Government Resource" ], "url": "http://www.kb.cert.org/vuls/id/895508" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.linuxsecurity.com/advisories/engarde_advisory-3517.html" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.mandriva.com/security/advisories?name=MDKSA-2003:081" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.novell.com/linux/security/advisories/2003_033_postfix.html" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Patch", "Vendor Advisory" ], "url": "http://www.redhat.com/support/errata/RHSA-2003-251.html" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.securityfocus.com/bid/8333" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A544" } ], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "NVD-CWE-Other" } ], "source": "nvd@nist.gov", "type": "Primary" } ] }
Vulnerability from fkie_nvd
Published
2001-11-11 05:00
Modified
2024-11-20 23:36
Severity ?
Summary
Vulnerability in Postfix SMTP server before 20010228-pl07, when configured to email the postmaster when SMTP errors cause the session to terminate, allows remote attackers to cause a denial of service (memory exhaustion) by generating a large number of SMTP errors, which forces the SMTP session log to grow too large.
References
Impacted products
Vendor | Product | Version | |
---|---|---|---|
wietse_venema | postfix | 1999-09-06 | |
wietse_venema | postfix | 1999-12-31 | |
wietse_venema | postfix | 2000-02-28 |
{ "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:wietse_venema:postfix:1999-09-06:*:*:*:*:*:*:*", "matchCriteriaId": "D8F498EC-BAB8-44E9-A1E9-F5FE59D969E7", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:1999-12-31:*:*:*:*:*:*:*", "matchCriteriaId": "3AC09670-77D3-40B7-BD0A-2F447FAB272E", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:2000-02-28:*:*:*:*:*:*:*", "matchCriteriaId": "711ECD8D-66D7-414E-B509-9F10A93FCED8", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "Vulnerability in Postfix SMTP server before 20010228-pl07, when configured to email the postmaster when SMTP errors cause the session to terminate, allows remote attackers to cause a denial of service (memory exhaustion) by generating a large number of SMTP errors, which forces the SMTP session log to grow too large." } ], "id": "CVE-2001-0894", "lastModified": "2024-11-20T23:36:22.797", "metrics": { "cvssMetricV2": [ { "acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0" }, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false } ] }, "published": "2001-11-11T05:00:00.000", "references": [ { "source": "cve@mitre.org", "url": "http://distro.conectiva.com.br/atualizacoes/?id=a\u0026anuncio=000439" }, { "source": "cve@mitre.org", "url": "http://frontal2.mandriva.com/security/advisories?name=MDKSA-2001:089" }, { "source": "cve@mitre.org", "url": "http://marc.info/?l=bugtraq\u0026m=100584160110303\u0026w=2" }, { "source": "cve@mitre.org", "tags": [ "Patch" ], "url": "http://www.debian.org/security/2001/dsa-093" }, { "source": "cve@mitre.org", "url": "http://www.redhat.com/support/errata/RHSA-2001-156.html" }, { "source": "cve@mitre.org", "tags": [ "Patch", "Vendor Advisory" ], "url": "http://www.securityfocus.com/bid/3544" }, { "source": "cve@mitre.org", "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/7568" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://distro.conectiva.com.br/atualizacoes/?id=a\u0026anuncio=000439" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://frontal2.mandriva.com/security/advisories?name=MDKSA-2001:089" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://marc.info/?l=bugtraq\u0026m=100584160110303\u0026w=2" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Patch" ], "url": "http://www.debian.org/security/2001/dsa-093" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.redhat.com/support/errata/RHSA-2001-156.html" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Patch", "Vendor Advisory" ], "url": "http://www.securityfocus.com/bid/3544" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/7568" } ], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "NVD-CWE-Other" } ], "source": "nvd@nist.gov", "type": "Primary" } ] }
Vulnerability from fkie_nvd
Published
2003-08-27 04:00
Modified
2024-11-20 23:44
Severity ?
Summary
Postfix 1.1.11 and earlier allows remote attackers to use Postfix to conduct "bounce scans" or DDos attacks of other hosts via an email address to the local host containing the target IP address and service name followed by a "!" string, which causes Postfix to attempt to use SMTP to communicate with the target on the associated port.
References
Impacted products
Vendor | Product | Version | |
---|---|---|---|
wietse_venema | postfix | 1.0.21 | |
wietse_venema | postfix | 1.1.11 | |
wietse_venema | postfix | 1999-09-06 | |
wietse_venema | postfix | 1999-12-31 | |
wietse_venema | postfix | 2000-02-28 | |
wietse_venema | postfix | 2001-11-15 | |
conectiva | linux | 7.0 | |
conectiva | linux | 8.0 |
{ "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:wietse_venema:postfix:1.0.21:*:*:*:*:*:*:*", "matchCriteriaId": "F8C70650-45F8-42F1-863E-C14CFD27986D", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:1.1.11:*:*:*:*:*:*:*", "matchCriteriaId": "6886742C-C8CF-4DE8-812C-30CB19984329", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:1999-09-06:*:*:*:*:*:*:*", "matchCriteriaId": "D8F498EC-BAB8-44E9-A1E9-F5FE59D969E7", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:1999-12-31:*:*:*:*:*:*:*", "matchCriteriaId": "3AC09670-77D3-40B7-BD0A-2F447FAB272E", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:2000-02-28:*:*:*:*:*:*:*", "matchCriteriaId": "711ECD8D-66D7-414E-B509-9F10A93FCED8", "vulnerable": true }, { "criteria": "cpe:2.3:a:wietse_venema:postfix:2001-11-15:*:*:*:*:*:*:*", "matchCriteriaId": "0C6E6C91-AE96-481F-92F5-C56F45ABE8E3", "vulnerable": true }, { "criteria": 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la m\u00e1quina local que contenga la direcci\u00f3n IP objetivo y el nombre del servicio seguido de una cadena \"!\", lo que hace que Postfix intente usar SMTP para comunicarse con el objetivo en el puerto asociado." } ], "id": "CVE-2003-0468", "lastModified": "2024-11-20T23:44:48.600", "metrics": { "cvssMetricV2": [ { "acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": { "accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0" }, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false } ] }, "published": "2003-08-27T04:00:00.000", "references": [ { "source": "cve@mitre.org", "url": 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"http://distro.conectiva.com.br/atualizacoes/?id=a\u0026anuncio=000717" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://marc.info/?l=bugtraq\u0026m=106001525130257\u0026w=2" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://secunia.com/advisories/9433" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": [ "Patch", "Vendor Advisory" ], "url": "http://www.debian.org/security/2003/dsa-363" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.mandriva.com/security/advisories?name=MDKSA-2003:081" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.novell.com/linux/security/advisories/2003_033_postfix.html" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.redhat.com/support/errata/RHSA-2003-251.html" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.securityfocus.com/bid/8333" }, { "source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A522" } ], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "NVD-CWE-Other" } ], "source": "nvd@nist.gov", "type": "Primary" } ] }
cve-2003-0468
Vulnerability from cvelistv5
Published
2003-08-05 04:00
Modified
2024-08-08 01:58
Severity ?
EPSS score ?
Summary
Postfix 1.1.11 and earlier allows remote attackers to use Postfix to conduct "bounce scans" or DDos attacks of other hosts via an email address to the local host containing the target IP address and service name followed by a "!" string, which causes Postfix to attempt to use SMTP to communicate with the target on the associated port.
References
▼ | URL | Tags |
---|---|---|
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000717 | vendor-advisory, x_refsource_CONECTIVA | |
http://www.securityfocus.com/bid/8333 | vdb-entry, x_refsource_BID | |
http://www.mandriva.com/security/advisories?name=MDKSA-2003:081 | vendor-advisory, x_refsource_MANDRAKE | |
http://www.redhat.com/support/errata/RHSA-2003-251.html | vendor-advisory, x_refsource_REDHAT | |
http://www.debian.org/security/2003/dsa-363 | vendor-advisory, x_refsource_DEBIAN | |
http://marc.info/?l=bugtraq&m=106001525130257&w=2 | mailing-list, x_refsource_BUGTRAQ | |
http://www.novell.com/linux/security/advisories/2003_033_postfix.html | vendor-advisory, x_refsource_SUSE | |
http://secunia.com/advisories/9433 | third-party-advisory, x_refsource_SECUNIA | |
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A522 | vdb-entry, signature, x_refsource_OVAL |
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cve-2005-0337
Vulnerability from cvelistv5
Published
2005-02-10 05:00
Modified
2024-08-07 21:13
Severity ?
EPSS score ?
Summary
Postfix 2.1.3, when /proc/net/if_inet6 is not available and permit_mx_backup is enabled in smtpd_recipient_restrictions, allows remote attackers to bypass e-mail restrictions and perform mail relaying by sending mail to an IPv6 hostname.
References
▼ | URL | Tags |
---|---|---|
http://www.redhat.com/support/errata/RHSA-2005-152.html | vendor-advisory, x_refsource_REDHAT | |
http://www.securityfocus.com/bid/12445 | vdb-entry, x_refsource_BID | |
http://marc.info/?l=bugtraq&m=110763358832637&w=2 | mailing-list, x_refsource_BUGTRAQ | |
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=267837 | x_refsource_CONFIRM | |
https://exchange.xforce.ibmcloud.com/vulnerabilities/19218 | vdb-entry, x_refsource_XF | |
http://secunia.com/advisories/14137/ | third-party-advisory, x_refsource_SECUNIA | |
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11339 | vdb-entry, signature, x_refsource_OVAL |
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cve-2001-0894
Vulnerability from cvelistv5
Published
2002-06-25 04:00
Modified
2024-08-08 04:37
Severity ?
EPSS score ?
Summary
Vulnerability in Postfix SMTP server before 20010228-pl07, when configured to email the postmaster when SMTP errors cause the session to terminate, allows remote attackers to cause a denial of service (memory exhaustion) by generating a large number of SMTP errors, which forces the SMTP session log to grow too large.
References
▼ | URL | Tags |
---|---|---|
http://www.debian.org/security/2001/dsa-093 | vendor-advisory, x_refsource_DEBIAN | |
http://www.securityfocus.com/bid/3544 | vdb-entry, x_refsource_BID | |
http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000439 | vendor-advisory, x_refsource_CONECTIVA | |
http://frontal2.mandriva.com/security/advisories?name=MDKSA-2001:089 | vendor-advisory, x_refsource_MANDRAKE | |
http://www.redhat.com/support/errata/RHSA-2001-156.html | vendor-advisory, x_refsource_REDHAT | |
https://exchange.xforce.ibmcloud.com/vulnerabilities/7568 | vdb-entry, x_refsource_XF | |
http://marc.info/?l=bugtraq&m=100584160110303&w=2 | mailing-list, x_refsource_BUGTRAQ |
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cve-2003-0540
Vulnerability from cvelistv5
Published
2003-08-05 04:00
Modified
2024-08-08 01:58
Severity ?
EPSS score ?
Summary
The address parser code in Postfix 1.1.12 and earlier allows remote attackers to cause a denial of service (lock) via (1) a malformed envelope address to a local host that would generate a bounce and contains the ".!" string in the MAIL FROM or Errors-To headers, which causes nqmgr to lock up, or (2) via a valid MAIL FROM with a RCPT TO containing a ".!" string, which causes an instance of the SMTP listener to lock up.
References
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