ASA-201710-1 generated external raw

[ASA-201710-1] dnsmasq: multiple issues
Arch Linux Security Advisory ASA-201710-1 ========================================= Severity: Critical Date : 2017-10-02 CVE-ID : CVE-2017-14491 CVE-2017-14492 CVE-2017-14493 CVE-2017-14494 CVE-2017-14495 CVE-2017-14496 Package : dnsmasq Type : multiple issues Remote : Yes Link : https://security.archlinux.org/AVG-421 Summary ======= The package dnsmasq before version 2.78-1 is vulnerable to multiple issues including arbitrary code execution, denial of service and information disclosure. Resolution ========== Upgrade to 2.78-1. # pacman -Syu "dnsmasq>=2.78-1" The problems have been fixed upstream in version 2.78. Workaround ========== None. Description =========== - CVE-2017-14491 (arbitrary code execution) A heap buffer overflow was found in dnsmasq in the code responsible for building DNS replies. An attacker could send crafted DNS packets to dnsmasq which would cause it to crash or, potentially, execute arbitrary code. - CVE-2017-14492 (arbitrary code execution) A heap buffer overflow was discovered in dnsmasq in the IPv6 router advertisement (RA) handling code. An attacker on the local network segment could send crafted RAs to dnsmasq which would cause it to crash or, potentially, execute arbitrary code. This issue only affected configurations using one of these options: enable-ra, ra-only, slaac, ra-names, ra-advrouter, or ra-stateless. - CVE-2017-14493 (arbitrary code execution) A stack buffer overflow was found in dnsmasq in the DHCPv6 code. An attacker on the local network could send a crafted DHCPv6 request to dnsmasq which would cause it to a crash or, potentially, execute arbitrary code. - CVE-2017-14494 (information disclosure) An information leak was found in dnsmasq in the DHCPv6 relay code. An attacker on the local network could send crafted DHCPv6 packets to dnsmasq causing it to forward the contents of process memory, potentially leaking sensitive data. - CVE-2017-14495 (denial of service) A memory exhaustion flaw was found in dnsmasq in the EDNS0 code. An attacker could send crafted DNS packets which would trigger memory allocations which would never be freed, leading to unbounded memory consumption and eventually a crash. This issue only affected configurations using one of the options: add-mac, add-cpe-id, or add- subnet. - CVE-2017-14496 (denial of service) An integer underflow flaw leading to a buffer over-read was found in dnsmasq in the EDNS0 code. An attacker could send crafted DNS packets to dnsmasq which would cause it to crash. This issue only affected configurations using one of the options: add-mac, add-cpe-id, or add- subnet. Impact ====== A remote attacker is able to execute arbitrary code, disclose sensitive information or crash the application by sending specially crafted packets. References ========== https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html https://github.com/google/security-research-pocs/tree/master/vulnerabilities/dnsmasq http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=0549c73b7ea6b22a3c49beb4d432f185a81efcbc http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=62cb936cb7ad5f219715515ae7d32dd281a5aa1f http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=24036ea507862c7b7898b68289c8130f85599c10 http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=3d4ff1ba8419546490b464418223132529514033 http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=33e3f1029c9ec6c63e430ff51063a6301d4b2262 http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=51eadb692a5123b9838e5a68ecace3ac579a3a45 http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=897c113fda0886a28a986cc6ba17bb93bd6cb1c7 https://security.archlinux.org/CVE-2017-14491 https://security.archlinux.org/CVE-2017-14492 https://security.archlinux.org/CVE-2017-14493 https://security.archlinux.org/CVE-2017-14494 https://security.archlinux.org/CVE-2017-14495 https://security.archlinux.org/CVE-2017-14496