Vulnerabilities > CVE-2010-0303 - Improper Input Validation vulnerability in Dinko Korunic Hybserv2 1.9.2/1.9.3/1.9.4

047910
CVSS 5.0 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
low complexity
dinko-korunic
CWE-20
nessus
exploit available

Summary

mystring.c in hybserv in IRCD-Hybrid (aka Hybrid2 IRC Services) 1.9.2 through 1.9.4 allows remote attackers to cause a denial of service (daemon crash) via a ":help \t" private message to the MemoServ service.

Vulnerable Configurations

Part Description Count
Application
Dinko_Korunic
3

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Server Side Include (SSI) Injection
    An attacker can use Server Side Include (SSI) Injection to send code to a web application that then gets executed by the web server. Doing so enables the attacker to achieve similar results to Cross Site Scripting, viz., arbitrary code execution and information disclosure, albeit on a more limited scale, since the SSI directives are nowhere near as powerful as a full-fledged scripting language. Nonetheless, the attacker can conveniently gain access to sensitive files, such as password files, and execute shell commands.
  • Cross Zone Scripting
    An attacker is able to cause a victim to load content into their web-browser that bypasses security zone controls and gain access to increased privileges to execute scripting code or other web objects such as unsigned ActiveX controls or applets. This is a privilege elevation attack targeted at zone-based web-browser security. In a zone-based model, pages belong to one of a set of zones corresponding to the level of privilege assigned to that page. Pages in an untrusted zone would have a lesser level of access to the system and/or be restricted in the types of executable content it was allowed to invoke. In a cross-zone scripting attack, a page that should be assigned to a less privileged zone is granted the privileges of a more trusted zone. This can be accomplished by exploiting bugs in the browser, exploiting incorrect configuration in the zone controls, through a cross-site scripting attack that causes the attackers' content to be treated as coming from a more trusted page, or by leveraging some piece of system functionality that is accessible from both the trusted and less trusted zone. This attack differs from "Restful Privilege Escalation" in that the latter correlates to the inadequate securing of RESTful access methods (such as HTTP DELETE) on the server, while cross-zone scripting attacks the concept of security zones as implemented by a browser.
  • Cross Site Scripting through Log Files
    An attacker may leverage a system weakness where logs are susceptible to log injection to insert scripts into the system's logs. If these logs are later viewed by an administrator through a thin administrative interface and the log data is not properly HTML encoded before being written to the page, the attackers' scripts stored in the log will be executed in the administrative interface with potentially serious consequences. This attack pattern is really a combination of two other attack patterns: log injection and stored cross site scripting.
  • Command Line Execution through SQL Injection
    An attacker uses standard SQL injection methods to inject data into the command line for execution. This could be done directly through misuse of directives such as MSSQL_xp_cmdshell or indirectly through injection of data into the database that would be interpreted as shell commands. Sometime later, an unscrupulous backend application (or could be part of the functionality of the same application) fetches the injected data stored in the database and uses this data as command line arguments without performing proper validation. The malicious data escapes that data plane by spawning new commands to be executed on the host.

Exploit-Db

descriptionHybserv2 ':help' Command Denial Of Service Vulnerability. CVE-2010-0303. Dos exploit for linux platform
idEDB-ID:33581
last seen2016-02-03
modified2010-01-29
published2010-01-29
reporterJulien Cristau
sourcehttps://www.exploit-db.com/download/33581/
titleHybserv2 - ':help' Command Denial Of Service Vulnerability

Nessus

NASL familyDebian Local Security Checks
NASL idDEBIAN_DSA-1982.NASL
descriptionJulien Cristau discovered that hybserv, a daemon running IRC services for IRCD-Hybrid, is prone to a denial of service attack via the commands option.
last seen2020-06-01
modified2020-06-02
plugin id44846
published2010-02-24
reporterThis script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/44846
titleDebian DSA-1982-1 : hybserv - denial of service
code
#%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-1982. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(44846);
  script_version("1.9");
  script_cvs_date("Date: 2019/08/02 13:32:22");

  script_cve_id("CVE-2010-0303");
  script_xref(name:"DSA", value:"1982");

  script_name(english:"Debian DSA-1982-1 : hybserv - denial of service");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Julien Cristau discovered that hybserv, a daemon running IRC services
for IRCD-Hybrid, is prone to a denial of service attack via the
commands option."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550389"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2010/dsa-1982"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the hybserv packages.

For the stable distribution (lenny), this problem has been fixed in
version 1.9.2-4+lenny2.

Due to a bug in the archive system, it is not possible to release the
fix for the oldstable distribution (etch) simultaneously. Therefore,
etch will be fixed in version 1.9.2-4+etch1 as soon as it becomes
available."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_cwe_id(20);

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:hybserv");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:5.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2010/01/29");
  script_set_attribute(attribute:"plugin_publication_date", value:"2010/02/24");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"5.0", prefix:"hybserv", reference:"1.9.2-4+lenny2")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");

Seebug

bulletinFamilyexploit
descriptionBUGTRAQ ID: 38006 CVE ID: CVE-2010-0303 Hybserv2是改进版的Hybserv IRC服务器,可提供即时会话服务。 Hybserv2的mystring.c文件中存在拒绝服务漏洞,远程用户可以通过向MemoServ服务发送包含有help \t选项的私人消息导致守护程序崩溃。 Hybserv2 Hybserv2 1.9.4 Hybserv2 Hybserv2 1.9.3 Hybserv2 Hybserv2 1.9.2 厂商补丁: Debian ------ Debian已经为此发布了一个安全公告(DSA-1982-1)以及相应补丁: DSA-1982-1:New hybserv packages fix denial of service 链接:http://www.debian.org/security/2010/dsa-1982 补丁下载: Source archives: http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2.orig.tar.gz Size/MD5 checksum: 418829 b0ebd0027c2b858ef8db6f06ac0d284b http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2.dsc Size/MD5 checksum: 1000 1e53e47576f3165f8dff86114b5fbf9d http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2.diff.gz Size/MD5 checksum: 12958 5af569d594f3208c96a3e02ee84ec4ba alpha architecture (DEC Alpha) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_alpha.deb Size/MD5 checksum: 237022 019c98668edd92146beb14cafe275e1d amd64 architecture (AMD x86_64 (AMD64)) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_amd64.deb Size/MD5 checksum: 231134 19d0a065dce4f37dba188c114d0d9a23 arm architecture (ARM) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_arm.deb Size/MD5 checksum: 212804 71c8f8d108effc0576f58cd4f4397d9a hppa architecture (HP PA RISC) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_hppa.deb Size/MD5 checksum: 233400 ec2a527b697dcf1be0c80b3a2622fa42 i386 architecture (Intel ia32) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_i386.deb Size/MD5 checksum: 210102 3e6afd1df128671cf09fb5ccc0ad475b ia64 architecture (Intel ia64) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_ia64.deb Size/MD5 checksum: 308362 57b37a7aad8fbdcf803086dc4284798c mipsel architecture (MIPS (Little Endian)) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_mipsel.deb Size/MD5 checksum: 227240 159f0509fdf4bb3287cdbb4d3fe6415a powerpc architecture (PowerPC) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_powerpc.deb Size/MD5 checksum: 229634 88cdd43d25c11741f33700518a13e16b s390 architecture (IBM S/390) http://security.debian.org/pool/updates/main/h/hybserv/hybserv_1.9.2-4+lenny2_s390.deb Size/MD5 checksum: 222108 92f96bb22103eac2d1a0f6787329f95f 补丁安装方法: 1. 手工安装补丁包: 首先,使用下面的命令来下载补丁软件: # wget url (url是补丁下载链接地址) 然后,使用下面的命令来安装补丁: # dpkg -i file.deb (file是相应的补丁名) 2. 使用apt-get自动安装补丁包: 首先,使用下面的命令更新内部数据库: # apt-get update 然后,使用下面的命令安装更新软件包: # apt-get upgrade
idSSV:19075
last seen2017-11-19
modified2010-02-06
published2010-02-06
reporterRoot
titleHybserv2 :help命令远程拒绝服务漏洞