CVE-2016-9843

Publication date 23 May 2017

Last updated 11 July 2025

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

9.8 · Critical

Score breakdown

Description

The crc32_big function in crc32.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact via vectors involving big-endian CRC calculation.

Read the notes from the security team

Status

Package Ubuntu Release Status
rsync 25.10 questing
Fixed 3.1.3-6
25.04 plucky
Fixed 3.1.3-6
24.10 oracular
Fixed 3.1.3-6
24.04 LTS noble
Fixed 3.1.3-6
23.10 mantic
Fixed 3.1.3-6
23.04 lunar
Fixed 3.1.3-6
22.10 kinetic
Fixed 3.1.3-6
22.04 LTS jammy
Fixed 3.1.3-6
21.10 impish
Fixed 3.1.3-6
21.04 hirsute
Fixed 3.1.3-6
20.10 groovy
Fixed 3.1.3-6
20.04 LTS focal
Fixed 3.1.3-6
19.10 eoan
Fixed 3.1.3-6
19.04 disco
Fixed 3.1.3-6
18.04 LTS bionic
Fixed 3.1.2-2.1ubuntu1.1
16.04 LTS xenial
Fixed 3.1.1-3ubuntu1.3
14.04 LTS trusty
Not affected
zlib 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Not affected
19.10 eoan
Not affected
19.04 disco
Not affected
18.10 cosmic
Not affected
18.04 LTS bionic
Not affected
17.10 artful
Not affected
17.04 zesty Ignored end of life
16.10 yakkety Ignored end of life
16.04 LTS xenial
Fixed 1:1.2.8.dfsg-2ubuntu4.3
14.04 LTS trusty
Vulnerable
12.04 LTS precise Ignored end of life
klibc 25.10 questing
Needs evaluation
25.04 plucky
Needs evaluation
24.10 oracular Ignored end of life, was needs-triage
24.04 LTS noble
Needs evaluation
23.10 mantic
Not affected
22.04 LTS jammy
Not affected
20.04 LTS focal
Not affected
18.04 LTS bionic
Not affected
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected
zsync 25.10 questing
Needs evaluation
25.04 plucky
Needs evaluation
24.10 oracular Ignored end of life, was needs-triage
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Needs evaluation
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation

Notes

mdeslaur

since 3.1.3-7, rsync builds with the system zlib

Patch details

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

Package Patch details
zlib

Severity score breakdown

Parameter Value
Base score 9.8 · Critical
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references