USN-7239-1: libmicrodns vulnerabilities
28 January 2025
Several security issues were fixed in libmicrodns.
Releases
Packages
- libmicrodns - minimal mDNS resolver and announcer library
Details
It was discovered that libmicrodns could recursively follow the same
compression pointer, leading to an infinite loop. An attacker could
possibly use this issue to cause a denial of service. (CVE-2020-6071)
It was discovered that libmicrodns did not check the return value of the
rr_decode function, which could lead to a double free. An attacker could
possibly use this issue to execute arbitrary code. (CVE-2020-6072)
It was discovered that libmicrodns incorrectly handled certain inputs,
which could lead to an integer overflow. An attacker could possibly use
this issue to cause a denial of service. (CVE-2020-6073)
It was discovered that libmicrodns incorrectly handled certain inputs,
which could lead to a out-of-bounds read. An attacker could possibly use
this issue to cause a denial of service. (CVE-2020-6077)
It was discovered that libmicrodns incorrectly handled memory when parsing
mDNS messages in mdns_recv, which could lead to a NULL pointer dereference.
An attacker could possibly use this issue to cause a denial of service.
(CVE-2020-6078)
It was discovered that libmicrodns incorrectly handled memory, which could
lead to excessive memory consumption due to memory leaks. An attacker
could possibly use this issue to cause a denial of service.
(CVE-2020-6079, CVE-2020-6080)
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 18.04
-
libmicrodns0
-
0.0.8-1ubuntu0.1~esm1
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.