CVE-2015-1781

Publication date 28 September 2015

Last updated 24 July 2024

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
eglibc	17.04 zesty	Not in release
	16.10 yakkety	Not in release
	16.04 LTS xenial	Not in release
	15.10 wily	Not in release
	15.04 vivid	Not in release
	14.10 utopic	Not in release
	14.04 LTS trusty	Fixed 2.19-0ubuntu6.8
	12.04 LTS precise	Fixed 2.15-0ubuntu10.14
	10.04 LTS lucid	Ignored end of life
glibc	17.04 zesty	Not affected
	16.10 yakkety	Not affected
	16.04 LTS xenial	Not affected
	15.10 wily	Fixed 2.21-0ubuntu4.2
	15.04 vivid	Ignored end of life
	14.10 utopic	Ignored end of life
	14.04 LTS trusty	Not in release
	12.04 LTS precise	Not in release
	10.04 LTS lucid	Not in release

Notes

sbeattie

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

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
glibc	Upstream: https://sourceware.org/git/?p=glibc.git;a=commit;h=2959eda9272a03386

CVE-2015-1781

From the Ubuntu Security Team

Status

Notes

sbeattie

Patch details

References

Related Ubuntu Security Notices (USN)

Other references