Executive Summary

Summary
Title exim security update
Informations
Name RHSA-2005:025 First vendor Publication 2005-02-15
Vendor RedHat Last vendor Modification 2005-02-15
Severity (Vendor) Moderate Revision 01

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score NA
Base Score NA Environmental Score NA
impact SubScore NA Temporal Score NA
Exploitabality Sub Score NA
 
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C)
Cvss Base Score 7.2 Attack Range Local
Cvss Impact Score 10 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

Problem Description:

Updated exim packages that resolve security issues are now available for Red Hat Enterprise Linux 4.

This update has been rated as having moderate security impact by the Red Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64 Red Hat Enterprise Linux Desktop version 4 - i386, x86_64 Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64 Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Problem description:

Exim is a mail transport agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

A buffer overflow was discovered in the spa_base64_to_bits function in Exim, as originally obtained from Samba code. If SPA authentication is enabled, a remote attacker may be able to exploit this vulnerability to execute arbitrary code as the 'exim' user. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-0022 to this issue. Please note that SPA authentication is not enabled by default in Red Hat Enterprise Linux 4.

Buffer overflow flaws were discovered in the host_aton and dns_build_reverse functions in Exim. A local user can trigger these flaws by executing exim with carefully crafted command line arguments and may be able to gain the privileges of the 'exim' account. The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2005-0021 to this issue.

Users of Exim are advised to update to these erratum packages which contain backported patches to correct these issues.

4. Solution:

Before applying this update, make sure that all previously-released errata relevant to your system have been applied. Use Red Hat Network to download and update your packages. To launch the Red Hat Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the following Web page for the System Administration or Customization guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

5. Bug IDs fixed (http://bugzilla.redhat.com/):

144099 - CAN-2005-0021 exim security issues (CAN-2005-0022)

Original Source

Url : https://rhn.redhat.com/errata/RHSA-2005-025.html

OVAL Definitions

Definition Id: oval:org.mitre.oval:def:10347
 
Oval ID: oval:org.mitre.oval:def:10347
Title: Perl-Compatible Regular Expression (PCRE) library before 7.3 allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via regex patterns containing unmatched "\Q\E" sequences with orphan "\E" codes.
Description: Multiple buffer overflows in Exim before 4.43 may allow attackers to execute arbitrary code via (1) an IPv6 address with more than 8 components, as demonstrated using the -be command line option, which triggers an overflow in the host_aton function, or (2) the -bh command line option or dnsdb PTR lookup, which triggers an overflow in the dns_build_reverse function.
Family: unix Class: vulnerability
Reference(s): CVE-2005-0021
 Version: 5
Platform(s): Red Hat Enterprise Linux 4
CentOS Linux 4
Oracle Linux 4
 Product(s):
Definition Synopsis:
Definition Id: oval:org.mitre.oval:def:11293
 
Oval ID: oval:org.mitre.oval:def:11293
Title: Perl-Compatible Regular Expression (PCRE) library before 7.3 allows context-dependent attackers to cause a denial of service (crash) and possibly execute arbitrary code via regex patterns containing unmatched "\Q\E" sequences with orphan "\E" codes.
Description: Buffer overflow in the spa_base64_to_bits function in Exim before 4.43, as originally obtained from Samba code, and as called by the auth_spa_client function, may allow attackers to execute arbitrary code during SPA authentication.
Family: unix Class: vulnerability
Reference(s): CVE-2005-0022
 Version: 5
Platform(s): Red Hat Enterprise Linux 4
CentOS Linux 4
Oracle Linux 4
 Product(s):
Definition Synopsis:

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 28

OpenVAS Exploits

Date Description
2008-09-24 Name : Gentoo Security Advisory GLSA 200501-23 (exim)
File : nvt/glsa_200501_23.nasl
2008-09-04 Name : exim -- two buffer overflow vulnerabilities
File : nvt/freebsd_exim.nasl
2008-01-17 Name : Debian Security Advisory DSA 635-1 (exim)
File : nvt/deb_635_1.nasl
2008-01-17 Name : Debian Security Advisory DSA 637-1 (exim-tls)
File : nvt/deb_637_1.nasl

Open Source Vulnerability Database (OSVDB)

Id Description
12946 Exim -bh Command Line Option dns_build_reverse Function Local Overflow

A local overflow exists in Exim. Exim fails to check the length of a string resulting in a buffer overflow in the dns_build_reverse() function. Exim drops SUID privileges before the vulnerable code is reached. With a specially crafted request, an attacker can further escalate privileges or retrieve the mailer uid to access email messages, resulting in a loss of integrity and confidentiality.
12727 Exim SPA Authentication spa_base64_to_bits Function Remote Overflow

A remote overflow exists in Exim. Exim fails to have sufficient boundary checks in the 'spa_base64_to_bits()' function resulting in a buffer overflow. With a specially crafted request, an attacker can execute arbitrary code in the context of the affected application resulting in a loss of integrity.
12726 Exim -be Command Line Option host_aton Function Local Overflow

A remote overflow exists in Exim. Exim fails to properly check input to host_aton() resulting in a buffer overflow. With a specially crafted request of an IPv6 address with more than 8 components, an attacker can cause execution of arbitrary code resulting in a loss of integrity.

Snort® IPS/IDS

Date Description
2014-01-10 AUTH user overflow attempt
RuleID : 3824 - Revision : 16 - Type : SERVER-MAIL

Nessus® Vulnerability Scanner

Date Description
2012-09-24 Name : The remote Fedora Core host is missing a security update.
File : fedora_2005-002.nasl - Type : ACT_GATHER_INFO
2006-01-15 Name : The remote Ubuntu host is missing one or more security-related patches.
File : ubuntu_USN-56-1.nasl - Type : ACT_GATHER_INFO
2005-07-13 Name : The remote FreeBSD host is missing one or more security-related updates.
File : freebsd_pkg_ca9ce8795ebb11d9a01c0050569f0001.nasl - Type : ACT_GATHER_INFO
2005-02-22 Name : The remote Red Hat host is missing one or more security updates.
File : redhat-RHSA-2005-025.nasl - Type : ACT_GATHER_INFO
2005-02-14 Name : The remote Gentoo host is missing one or more security-related patches.
File : gentoo_GLSA-200501-23.nasl - Type : ACT_GATHER_INFO
2005-01-13 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-637.nasl - Type : ACT_GATHER_INFO
2005-01-12 Name : The remote Debian host is missing a security-related update.
File : debian_DSA-635.nasl - Type : ACT_GATHER_INFO
2005-01-07 Name : The remote mail server is vulnerable to a buffer overflow attack.
File : exim_spa_ipv6_overflow.nasl - Type : ACT_GATHER_INFO
2005-01-07 Name : The remote Fedora Core host is missing a security update.
File : fedora_2005-001.nasl - Type : ACT_GATHER_INFO

Alert History

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Date Informations
2014-02-17 11:48:53
  • Multiple Updates