var-200505-0479
Vulnerability from variot
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.
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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.
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"data": "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. \nAn attacker may leverage these issues to manipulate cache data, potentially facilitating man-in-the-middle, site impersonation, or denial of service attacks. \nA 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. \nReportedly, exploitation of the cache-poisoning issue is not trivial as improvements were made to the application to mitigate cache-poisoning attacks. \nThe 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. \nDue to a lack of details, further information is not available at the moment. This BID will be updated when more information becomes available. \n----------------------------------------------------------------------\n\nWant a new IT Security job?\n\nVacant positions at Secunia:\nhttp://secunia.com/secunia_vacancies/\n\n----------------------------------------------------------------------\n\nTITLE:\nDnsmasq DHCP Lease File Denial of Service and DNS Cache Poisoning\n\nSECUNIA ADVISORY ID:\nSA14691\n\nVERIFY ADVISORY:\nhttp://secunia.com/advisories/14691/\n\nCRITICAL:\nModerately critical\n\nIMPACT:\nSpoofing, Manipulation of data, DoS\n\nWHERE:\n\u003eFrom remote\n\nSOFTWARE:\nDnsmasq 2.x\nhttp://secunia.com/product/4837/\n\nDESCRIPTION:\nTwo vulnerabilities have been reported in Dnsmasq, which can be\nexploited by malicious people to cause a DoS (Denial of Service) or\npoison the DNS cache. \n\n1) An off-by-one boundary error when reading the DHCP lease file can\nbe exploited by a malicious DHCP client to cause a buffer overflow by\nsupplying an overly long hostname and client-id. \n\nSuccessful exploitation crashes Dnsmasq the next time it is started. \n\n2) When receiving DNS replies, only the 16-bit ID is checked against\nthe current query. This can be exploited to poison the DNS cache if a\nvalid ID (randomly generated) is guessed by e.g. sending a flood of\nDNS replies. \n\nSOLUTION:\nUpdate to version 2.21. \nhttp://www.thekelleys.org.uk/dnsmasq/\n\nPROVIDED AND/OR DISCOVERED BY:\n1) The vendor credits Rob Holland. \n2) Reported by vendor. \n\nORIGINAL ADVISORY:\nhttp://www.thekelleys.org.uk/dnsmasq/CHANGELOG\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n",
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.