Vulnerabilities > CVE-2006-3251 - Improper Restriction of Operations Within the Bounds of A Memory Buffer vulnerability in Hashcash
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
PARTIAL Integrity impact
PARTIAL Availability impact
PARTIAL Summary
Heap-based buffer overflow in the array_push function in hashcash.c for Hashcash before 1.21 might allow attackers to execute arbitrary code via crafted entries.
Vulnerable Configurations
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 Debian Local Security Checks NASL id DEBIAN_DSA-1114.NASL description Andreas Seltenreich discovered a buffer overflow in hashcash, a postage payment scheme for email that is based on hash calculations, which could allow attackers to execute arbitrary code via specially crafted entries. last seen 2020-06-01 modified 2020-06-02 plugin id 22656 published 2006-10-14 reporter This script is Copyright (C) 2006-2019 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/22656 title Debian DSA-1114-1 : hashcash - buffer overflow 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-1114. The text # itself is copyright (C) Software in the Public Interest, Inc. # include("compat.inc"); if (description) { script_id(22656); script_version("1.16"); script_cvs_date("Date: 2019/08/02 13:32:19"); script_cve_id("CVE-2006-3251"); script_bugtraq_id(18659); script_xref(name:"DSA", value:"1114"); script_name(english:"Debian DSA-1114-1 : hashcash - buffer overflow"); 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: "Andreas Seltenreich discovered a buffer overflow in hashcash, a postage payment scheme for email that is based on hash calculations, which could allow attackers to execute arbitrary code via specially crafted entries." ); script_set_attribute( attribute:"see_also", value:"http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=376444" ); script_set_attribute( attribute:"see_also", value:"http://www.debian.org/security/2006/dsa-1114" ); script_set_attribute( attribute:"solution", value: "Upgrade the hashcash package. For the stable distribution (sarge) this problem has been fixed in version 1.17-1sarge1." ); script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P"); script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C"); script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available"); script_set_attribute(attribute:"exploit_available", value:"false"); script_set_attribute(attribute:"plugin_type", value:"local"); script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:hashcash"); script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:3.1"); script_set_attribute(attribute:"patch_publication_date", value:"2006/07/21"); script_set_attribute(attribute:"plugin_publication_date", value:"2006/10/14"); script_set_attribute(attribute:"vuln_publication_date", value:"2006/03/24"); script_end_attributes(); script_category(ACT_GATHER_INFO); script_copyright(english:"This script is Copyright (C) 2006-2019 Tenable Network Security, Inc."); 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:"3.1", prefix:"hashcash", reference:"1.17-1sarge1")) flag++; if (flag) { if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get()); else security_hole(0); exit(0); } else audit(AUDIT_HOST_NOT, "affected");
NASL family Gentoo Local Security Checks NASL id GENTOO_GLSA-200606-25.NASL description The remote host is affected by the vulnerability described in GLSA-200606-25 (Hashcash: Possible heap overflow) Andreas Seltenreich has reported a possible heap overflow in the array_push() function in hashcash.c, as a result of an incorrect amount of allocated memory for the last seen 2020-06-01 modified 2020-06-02 plugin id 21758 published 2006-06-27 reporter This script is Copyright (C) 2006-2019 Tenable Network Security, Inc. source https://www.tenable.com/plugins/nessus/21758 title GLSA-200606-25 : Hashcash: Possible heap overflow
References
- http://secunia.com/advisories/20800
- http://secunia.com/advisories/20846
- http://secunia.com/advisories/21146
- http://www.debian.org/security/2006/dsa-1114
- http://www.gentoo.org/security/en/glsa/glsa-200606-25.xml
- http://www.hashcash.org/source/CHANGELOG
- http://www.securityfocus.com/bid/18659
- http://www.vupen.com/english/advisories/2006/2551
- https://exchange.xforce.ibmcloud.com/vulnerabilities/27422