Vulnerabilities > CVE-2009-4893 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Unrealircd
Attack vector
NETWORK Attack complexity
MEDIUM Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
Buffer overflow in UnrealIRCd 3.2beta11 through 3.2.8, when allow::options::noident is enabled, allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 31 |
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.
- Overflow Buffers Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
- Client-side Injection-induced Buffer Overflow This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
- Filter Failure through Buffer Overflow In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
- MIME Conversion An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.
Nessus
| NASL family | Gentoo Local Security Checks |
| NASL id | GENTOO_GLSA-201006-21.NASL |
| description | The remote host is affected by the vulnerability described in GLSA-201006-21 (UnrealIRCd: Multiple vulnerabilities) Multiple vulnerabilities have been reported in UnrealIRCd: The vendor reported a buffer overflow in the user authorization code (CVE-2009-4893). The vendor reported that the distributed source code of UnrealIRCd was compromised and altered to include a system() call that could be called with arbitrary user input (CVE-2010-2075). Impact : A remote attacker could exploit these vulnerabilities to cause the execution of arbitrary commands with the privileges of the user running UnrealIRCd, or a Denial of Service condition. NOTE: By default UnrealIRCd on Gentoo is run with the privileges of the |
| last seen | 2020-06-01 |
| modified | 2020-06-02 |
| plugin id | 47016 |
| published | 2010-06-15 |
| reporter | This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof. |
| source | https://www.tenable.com/plugins/nessus/47016 |
| title | GLSA-201006-21 : UnrealIRCd: Multiple vulnerabilities |
| code | |