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CVE-2015-1781

Published: 28 September 2015

Buffer overflow in the gethostbyname_r and other unspecified NSS functions in the GNU C Library (aka glibc or libc6) before 2.22 allows context-dependent attackers to cause a denial of service (crash) or execute arbitrary code via a crafted DNS response, which triggers a call with a misaligned buffer.

From the Ubuntu security team

Arjun Shankar discovered that in certain situations the nss_dns code in the GNU C Library did not properly account buffer sizes when passed an unaligned buffer. An attacker could use this to cause a denial of service or possibly execute arbitrary code.

Priority

Low

Status

Package Release Status
eglibc
Launchpad, Ubuntu, Debian
lucid Ignored
(reached end-of-life)
precise
Released (2.15-0ubuntu10.14)
trusty
Released (2.19-0ubuntu6.8)
upstream Needs triage

utopic Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

glibc
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Does not exist

trusty Does not exist

upstream Needs triage

utopic Ignored
(reached end-of-life)
vivid Ignored
(reached end-of-life)
wily
Released (2.21-0ubuntu4.2)
xenial Not vulnerable
(2.23-0ubuntu1)
yakkety Not vulnerable
(2.23-0ubuntu1)
zesty Not vulnerable
(2.23-0ubuntu1)

Notes

AuthorNote
sbeattie
only happens if gethostbyname_r etc functions are called with a misaligned
buffer, which according to upstream in practice does not happen often

References

Bugs