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Short Name |
DNS:REQUEST:DNS-INT-UNDERFLOW |
|---|---|
Severity |
Minor |
Recommended |
Yes |
Recommended Action |
Drop |
Category |
DNS |
Keywords |
DNSmasq answer_auth and answer_request Integer Underflow |
Release Date |
2017/10/24 |
Update Number |
3000 |
Supported Platforms |
idp-4.0+, isg-3.0+, j-series-9.5+, mx-11.4+, srx-12.1+, srx-branch-12.1+, vmx-17.4+, vsrx-12.1+, vsrx3bsd-18.2+ |
DNS: DNSmasq answer_auth and answer_request Integer Underflow
An integer underflow vulnerability has been reported in dnsmasq. A remote, unauthenticated attacker can exploit this vulnerability by sending a large UDP packet to the target system. Successful exploitation results in termination of the dnsmasq process.
Extended Description
In dnsmasq before 2.78, if the DNS packet size does not match the expected size, the size parameter in a memset call gets a negative value. As it is an unsigned value, memset ends up writing up to 0xffffffff zero's (0xffffffffffffffff in 64 bit platforms), making dnsmasq crash.
Affected Products
- Canonical ubuntu_linux 14.04
- Canonical ubuntu_linux 16.04
- Canonical ubuntu_linux 17.04
- Debian debian_linux 7.0
- Debian debian_linux 7.1
- Debian debian_linux 9.0
- Fedoraproject fedora 27
- Novell leap 42.2
- Novell leap 42.3
- Redhat enterprise_linux_desktop 7.0
- Redhat enterprise_linux_server 7.0
- Redhat enterprise_linux_workstation 7.0
- Thekelleys dnsmasq 2.77
References
- BugTraq: 101085
- CVE: CVE-2017-13704