CVE-2016-9841: Critical severity Apple tvOS vulnerability
An old inffast.c optimization turns out to not be optimal anymore with modern compilers, and furthermore was not compliant with the C standard, for which decrementing a pointer before its allocated memory is undefined.
External References:
https://wiki.mozilla.org/images/0/09/Zlib-report.pdf https://docs.google.com/document/d/10i1KZS5so8xDqH2rplRa2xet0tyTvvJlLbQQmZIUIKE/edit#heading=h.t13tvnx4loq7
Upstream patch:
https://github.com/madler/zlib/commit/9aaec95e82117c1cb0f9624264c3618fc380cecb
CVE assignment:
http://seclists.org/oss-sec/2016/q4/602
Other sources
inffast.c in zlib 1.2.8 might allow context-dependent attackers to have unspecified impact by leveraging improper pointer arithmetic
— Microsoft
zlib. Multiple issues were addressed by updating to version 1.2.11.
Credit
Affected Software
Remediation
Patch Available
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2017-13832
- CVE-2017-13829
- CVE-2017-13833
- CVE-2017-7083
- CVE-2017-0381
- CVE-2017-13825
- CVE-2017-13815
- CVE-2017-13828
- CVE-2017-13830
- CVE-2017-13814
- CVE-2017-13831
- CVE-2017-13817
- CVE-2017-13818
- CVE-2017-13836
- CVE-2017-13841
- CVE-2017-13840
- CVE-2017-13842
- CVE-2017-13782
- CVE-2017-13843
- CVE-2017-7114
- CVE-2017-13854
- CVE-2017-13834
- CVE-2017-13873
- CVE-2017-13813
- CVE-2017-13816
- CVE-2017-13812
- CVE-2017-7086
- CVE-2017-1000373
- CVE-2016-9063
- CVE-2017-9233
- CVE-2017-9049
- CVE-2017-5130
- CVE-2017-7376
- CVE-2017-9050
- CVE-2017-13822
- CVE-2017-7080
- CVE-2017-10989
- CVE-2017-7128
- CVE-2017-7129
- CVE-2017-7130
- CVE-2017-7127
- CVE-2017-7081
- CVE-2017-7087
- CVE-2017-7091
- CVE-2017-7092
- CVE-2017-7093
- CVE-2017-7094
- CVE-2017-7095
- CVE-2017-7096
- CVE-2017-7098
- CVE-2017-7099
- CVE-2017-7100
- CVE-2017-7102
- CVE-2017-7104
- CVE-2017-7107
- CVE-2017-7111
- CVE-2017-7117
- CVE-2017-7120
- CVE-2017-7090
- CVE-2017-7109
- CVE-2017-11120
- CVE-2017-11121
- CVE-2017-7103
- CVE-2017-7105
- CVE-2017-7108
- CVE-2017-7110
- CVE-2017-7112
- CVE-2017-7115
- CVE-2017-7116
- CVE-2017-11122
- CVE-2016-9840
- CVE-2016-9841
- CVE-2016-9842
- CVE-2016-9843
- CVE-2016-0736
- CVE-2016-2161
- CVE-2016-5387
- CVE-2016-8740
- CVE-2016-8743
- CVE-2017-13909
- CVE-2017-13809
- CVE-2017-7084
- CVE-2017-7074
- CVE-2017-13820
- CVE-2017-13807
- CVE-2017-7143
- CVE-2017-13821
- CVE-2017-13890
- CVE-2017-13851
- CVE-2017-7138
- CVE-2017-7121
- CVE-2017-7122
- CVE-2017-7123
- CVE-2017-7124
- CVE-2017-7125
- CVE-2017-7126
- CVE-2017-13811
- CVE-2017-13835
- CVE-2017-11103
- CVE-2017-13819
- CVE-2017-13837
- CVE-2017-13906
- CVE-2017-7077
- CVE-2017-7119
- CVE-2017-13810
- CVE-2017-13827
- CVE-2016-4736
- CVE-2018-4302
- CVE-2017-7141
- CVE-2017-7078
- CVE-2017-6451
- CVE-2017-6452
- CVE-2017-6455
- CVE-2017-6458
- CVE-2017-6459
- CVE-2017-6460
- CVE-2017-6462
- CVE-2017-6463
- CVE-2017-6464
- CVE-2016-9042
- CVE-2017-13824
- CVE-2017-13846
- CVE-2017-10140
- CVE-2017-7132
- CVE-2017-13823
- CVE-2017-13808
- CVE-2017-13838
- CVE-2017-7082
- CVE-2017-13908
- CVE-2017-13839
- CVE-2017-13910
- CVE-2017-13863
- CVE-2017-7131
- CVE-2017-7088
- CVE-2017-7072
- CVE-2017-7140
- CVE-2017-7148
- CVE-2017-7097
- CVE-2017-7118
- CVE-2017-7133
- CVE-2017-7075
- CVE-2017-7139
- CVE-2017-13806
- CVE-2017-7085
- CVE-2017-13877
- CVE-2017-7146
- CVE-2017-6211
- CVE-2017-7145
- CVE-2017-7089
- CVE-2017-7106
- CVE-2017-7144
- CVE-2017-7142
Frequently Asked Questions
What is the severity of CVE-2016-9841?
CVE-2016-9841 has been classified as a moderate severity vulnerability due to its compliance issues with the C standard.
How do I fix CVE-2016-9841?
To fix CVE-2016-9841, update to a version of affected software that is compliant, such as zlib 1.2.10 or later.
Which versions are affected by CVE-2016-9841?
CVE-2016-9841 affects several versions of software including zlib versions prior to 1.2.10 and Apple products running macOS versions up to 10.13.
Who is affected by CVE-2016-9841?
Users of Apple iOS, macOS, watchOS, and various Linux distributions with vulnerable zlib versions are affected by CVE-2016-9841.
What are the potential implications of CVE-2016-9841?
The implications of CVE-2016-9841 may include instability or unexpected behavior in applications utilizing the vulnerable zlib library.