漏洞描述
OpenSMTPD before 6.6.4 allows remote code execution because of an out-of-bounds read in mta_io in mta_session.c for multi-line replies. Although this vulnerability affects the client side of OpenSMTPD, it is possible to attack a server because the server code launches the client code during bounce handling.
影响产品
修复建议
建议关注厂商安全公告，及时升级至已修复版本，并结合实际资产暴露情况采取缓解措施。
参考链接
www.openbsd.orghttps://www.openbsd.org/security.html↗www.openwall.comhttp://www.openwall.com/lists/oss-security/2021/05/04/7↗www.openwall.comhttp://www.openwall.com/lists/oss-security/2020/03/01/2↗www.openwall.comhttp://www.openwall.com/lists/oss-security/2020/02/26/1↗usn.ubuntu.comhttps://usn.ubuntu.com/4294-1/↗www.openwall.comhttps://www.openwall.com/lists/oss-security/2020/02/24/5↗packetstormsecurity.comhttp://packetstormsecurity.com/files/156633/OpenSMTPD-Out-Of-Bounds-Read-Local-Privilege-Escalation.html↗www.debian.orghttps://www.debian.org/security/2020/dsa-4634↗www.openwall.comhttp://www.openwall.com/lists/oss-security/2020/03/01/1↗seclists.orghttp://seclists.org/fulldisclosure/2020/Feb/32↗lists.fedoraproject.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OPH4QU4DNVHA7ACFXMYFCEP5PSXXPN4E/↗