PoPToP PPTP read()参数负值远程缓冲区溢出漏洞

漏洞信息详情

PoPToP PPTP read()参数负值远程缓冲区溢出漏洞

漏洞简介

PoPToP PPTP一般用于建立VPN连接,使用在Windows操作系统下。

PoPToP PPTP在引用用户提供的输入用于各种计算时缺少正确过滤检查,远程攻击者可以利用这个漏洞破坏服务程序进程的敏感内存,可能以PoPToP进程权限在系统上执行任意指令。

漏洞公告

临时解决方法:

如果您不能立刻安装补丁或者升级,CNNVD建议您采取以下措施以降低威胁:

* Timo Sirainen <tss@iki.fi>提供如下第三方补丁:

— ctrlpacket.c.old 1999-12-23 23:43:33.000000000 +0200

+++ ctrlpacket.c 2003-04-09 18:58:21.000000000 +0300

@@ -254,8 +254,8 @@

}

/* OK, we have (at least) the first 2 bytes, and there is data waiting */

length = htons(*(u_int16_t *) packet);

– if (length > PPTP_MAX_CTRL_PCKT_SIZE) {

– syslog(LOG_ERR, “CTRL: Control packet > PPTP_MAX_CTRL_PCKT_SIZE (length = %d)”, length);

+ if (length <= 10 || length > PPTP_MAX_CTRL_PCKT_SIZE) {

+ syslog(LOG_ERR, “CTRL: 11 < Control packet (length=%d) < “, length);

/* we loose sync (unless we malloc something big, which isn’t a good

* idea – potential DoS) so we must close connection (draft states that

* if you loose sync you must close the control connection immediately)

厂商补丁:

PoPToP

——

目前厂商还没有提供补丁或者升级程序,我们建议使用此软件的用户随时关注厂商的主页以获取最新版本:


http://www.poptop.org” target=”_blank”>


http://www.poptop.org

参考网址

来源:US-CERT Vulnerability Note: VU#673993

名称: VU#673993

链接:http://www.kb.cert.org/vuls/id/673993

来源: BID

名称: 7316

链接:http://www.securityfocus.com/bid/7316

来源: BUGTRAQ

名称: 20030409 PoPToP PPTP server remotely exploitable buffer overflow

链接:http://www.securityfocus.com/archive/1/317995

来源: DEBIAN

名称: DSA-295

链接:http://www.debian.org/security/2003/dsa-295

来源: SUSE

名称: SuSE-SA:2003:029

链接:http://www.novell.com/linux/security/advisories/2003_029.html

来源: BUGTRAQ

名称: 20030418 Exploit for PoPToP PPTP server

链接:http://marc.theaimsgroup.com/?l=bugtraq&m=105068728421160&w=2

来源: BUGTRAQ

名称: 20030422 Re: Exploit for PoPToP PPTP server – Linux version

链接:http://www.securityfocus.com/archive/1/319428

来源: sourceforge.net

链接:http://sourceforge.net/project/shownotes.php?release_id=138437

来源: BUGTRAQ

名称: 20030428 GLSA: pptpd (200304-08)

链接:http://marc.theaimsgroup.com/?l=bugtraq&m=105154539727967&w=2

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