Use-after-free in c-ares - CVE-2020-14354
Published: September 30, 2021
Vulnerability identifier: #VU56968
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-14354
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: c-ares.haxx.se
Affected software:
c-ares
c-ares
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error and double-free in c-ares, if the ares_destroy() function is called prior to the ares_getaddrinfo() completing. A remote attacker can perform a denial of service (DoS) attack.
How to mitigate CVE-2020-14354
Install updates from vendor's website.
Sources
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXNULZBBK4O6/
- https://github.com/c-ares/c-ares/commit/1cc7e83c3bdfaafbc5919c95025592d8de3a170e
- https://bugzilla.redhat.com/show_bug.cgi?id=1866838
- https://c-ares.haxx.se/changelog.html
- https://packetstormsecurity.com/files/158755/GS20200804145053.txt