CVE-2013-7423 Other in n/a

Medium 5.0 Published 24 Feb 2015 Updated 6 Aug 2024

Remote attackers can redirect DNS queries to unintended locations by exploiting improper file descriptor reuse in glibc's resolver.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2013-7423?

CVE-2013-7423 is a medium-severity vulnerability in Canonical Ubuntu Linux, published on 24 Feb 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

The send_dg function in resolv/res_send.c in GNU C Library (aka glibc or libc6) before 2.20 does not properly reuse file descriptors, which allows remote attackers to send DNS queries to unintended locations via a large number of requests that trigger a call to the getaddrinfo function.

Weakness: CWE-17

Which versions are affected by CVE-2013-7423?

It affects 4 products.

Linux distribution packages (9)

`glibc` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`
`glibc-common` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`
`glibc-debuginfo` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`
`glibc-debuginfo-common` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`
`glibc-devel` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`
`glibc-headers` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`
`glibc-static` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`
`glibc-utils` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`
`nscd` Red Hat:rhel_aus:6.5::server	All versions	`0:2.12-1.132.el6_5.8`

Products include Canonical Ubuntu Linux, Gnu Glibc, Opensuse Opensuse, Redhat Enterprise Linux Server Aus.

How do I fix CVE-2013-7423?

Upgrade to a fixed version.

Is CVE-2013-7423 being exploited?

There is no known exploitation of CVE-2013-7423 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as DEBIAN-CVE-2013-7423, GHSA-7q6m-8g97-jq6m, RHSA-2016:1207, UBUNTU-CVE-2013-7423.