Double Free in nmap - CVE-2017-18594
Published: September 26, 2019
Vulnerability identifier: #VU21370
CSH Severity: Low
CVSS v4: 2.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-18594
CWE-ID: CWE-415
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform denial of service (DoS) attack.
The vulnerability exists due to a boundary error when processing failed SSH connections in nse_libssh2.cc script in nmap. A remote attacker can trigger a double free error and perform a denial of service attack against the port scanner during scan process.
Affected software
nmap
nmap (Alpine package)
Opensuse
nmap (Alpine package)
Opensuse
How to mitigate CVE-2017-18594
Install updates from vendor's website.
nmap - update to 7.80
nmap (Alpine package) - update to 7.60-r3
nmap (Alpine package) - update to 7.60-r3
External References
- https://github.com/AMatchandaHaystack/Research/blob/master/Nmap%26libsshDF
- https://github.com/nmap/nmap/commit/350bbe0597d37ad67abe5fef8fba984707b4e9ad
- https://github.com/nmap/nmap/issues/1077
- https://github.com/nmap/nmap/issues/1227
- https://seclists.org/nmap-announce/2019/0
- https://seclists.org/nmap-dev/2018/q2/45