ID

VAR-200505-0479

CVE

CVE-2005-0877

TITLE

Dnsmasq Multiple Remote Vulnerabilities

DESCRIPTION

Dnsmasq before 2.21 allows remote attackers to poison the DNS cache via answers to queries that were not made by Dnsmasq. Dnsmasq is reported prone to multiple remote vulnerabilities. These issues can allow an attacker to exploit an off-by-one overflow condition and carry out DNS cache poisoning attacks. An attacker may leverage these issues to manipulate cache data, potentially facilitating man-in-the-middle, site impersonation, or denial of service attacks. A denial of service condition may occur due to the off-by-one overflow vulnerability. Although unconfirmed, there is a circumstantial possibility of remote code execution in the context of the server. Reportedly, exploitation of the cache-poisoning issue is not trivial as improvements were made to the application to mitigate cache-poisoning attacks. The off-by-one overflow issue affects Dnsmasq 2.14, 2.15, 2.16, 2.17, 2.18, 2.19 and 2.20. The cache-poisoning issue affects Dnsmasq 2.20 and prior. Due to a lack of details, further information is not available at the moment. This BID will be updated when more information becomes available. ---------------------------------------------------------------------- Want a new IT Security job? Vacant positions at Secunia: http://secunia.com/secunia_vacancies/ ---------------------------------------------------------------------- TITLE: Dnsmasq DHCP Lease File Denial of Service and DNS Cache Poisoning SECUNIA ADVISORY ID: SA14691 VERIFY ADVISORY: http://secunia.com/advisories/14691/ CRITICAL: Moderately critical IMPACT: Spoofing, Manipulation of data, DoS WHERE: >From remote SOFTWARE: Dnsmasq 2.x http://secunia.com/product/4837/ DESCRIPTION: Two vulnerabilities have been reported in Dnsmasq, which can be exploited by malicious people to cause a DoS (Denial of Service) or poison the DNS cache. 1) An off-by-one boundary error when reading the DHCP lease file can be exploited by a malicious DHCP client to cause a buffer overflow by supplying an overly long hostname and client-id. Successful exploitation crashes Dnsmasq the next time it is started. 2) When receiving DNS replies, only the 16-bit ID is checked against the current query. This can be exploited to poison the DNS cache if a valid ID (randomly generated) is guessed by e.g. sending a flood of DNS replies. SOLUTION: Update to version 2.21. http://www.thekelleys.org.uk/dnsmasq/ PROVIDED AND/OR DISCOVERED BY: 1) The vendor credits Rob Holland. 2) Reported by vendor. ORIGINAL ADVISORY: http://www.thekelleys.org.uk/dnsmasq/CHANGELOG ---------------------------------------------------------------------- About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities. Subscribe: http://secunia.com/secunia_security_advisories/ Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/ Please Note: Secunia recommends that you verify all advisories you receive by clicking the link. Secunia NEVER sends attached files with advisories. Secunia does not advise people to install third party patches, only use those supplied by the vendor. ---------------------------------------------------------------------- Unsubscribe: Secunia Security Advisories http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org ----------------------------------------------------------------------

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

lack of information

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

The vendor disclosed these issues.

SOURCES

LAST UPDATE DATE

2024-08-14T13:40:11.789000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE