Headline
CVE-2015-7547: USN-2900-1: GNU C Library vulnerability | Ubuntu security notices | Ubuntu
Multiple stack-based buffer overflows in the (1) send_dg and (2) send_vc functions in the libresolv library in the GNU C Library (aka glibc or libc6) before 2.23 allow remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via a crafted DNS response that triggers a call to the getaddrinfo function with the AF_UNSPEC or AF_INET6 address family, related to performing “dual A/AAAA DNS queries” and the libnss_dns.so.2 NSS module.
Details
It was discovered that the GNU C Library incorrectly handled receiving
responses while performing DNS resolution. A remote attacker could use this
issue to cause the GNU C Library to crash, resulting in a denial of
service, or possibly execute arbitrary code.
Update instructions
The problem can be corrected by updating your system to the following package versions:
Ubuntu 15.10
- libc6 - 2.21-0ubuntu4.1
Ubuntu 14.04
- libc6 - 2.19-0ubuntu6.7
Ubuntu 12.04
- libc6 - 2.15-0ubuntu10.13
After a standard system update you need to reboot your computer to make
all the necessary changes.
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