Security Fixes and Rewards

Note: Access to bug details and links may be kept restricted until a majority of users are updated with a fix. We will also retain restrictions if the bug exists in a third party library that other projects similarly depend on, but haven’t yet fixed.

This update includes 36 security fixes. Below, we highlight fixes that were contributed by external researchers. Please see the Chrome Security Page for more information.

[$30000][1137179] Critical CVE-2021-21117: Insufficient policy enforcement in Cryptohome. Reported by Rory McNamara on 2020-10-10

[$16000][1161357] High CVE-2021-21118: Insufficient data validation in V8. Reported by Tyler Nighswander (@tylerni7) of Theori on 2020-12-23

[$5000][1160534] High CVE-2021-21119: Use after free in Media. Reported by Anonymous on 2020-12-20

[$5000][1160602] High CVE-2021-21120: Use after free in WebSQL. Reported by Nan Wang(@eternalsakura13) and Guang Gong of 360 Alpha Lab on 2020-12-21

[$5000][1161143] High CVE-2021-21121: Use after free in Omnibox. Reported by Leecraso and Guang Gong of 360 Alpha Lab on 2020-12-22

[$5000][1162131] High CVE-2021-21122: Use after free in Blink. Reported by Renata Hodovan on 2020-12-28

[$1000][1137247] High CVE-2021-21123: Insufficient data validation in File System API. Reported by Maciej Pulikowski on 2020-10-11

[$N/A][1131346] High CVE-2021-21124: Potential user after free in Speech Recognizer. Reported by Chaoyang Ding(@V4kst1z) from Codesafe Team of Legendsec at Qi'anxin Group on 2020-09-23

[$N/A][1152327] High CVE-2021-21125: Insufficient policy enforcement in File System API. Reported by Ron Masas (Imperva) on 2020-11-24

[$N/A][1163228] High CVE-2020-16044: Use after free in WebRTC. Reported by Ned Williamson of Project Zero on 2021-01-05

[$3000][1108126] Medium CVE-2021-21126: Insufficient policy enforcement in extensions. Reported by David Erceg on 2020-07-22

[$3000][1115590] Medium CVE-2021-21127: Insufficient policy enforcement in extensions. Reported by Jasminder Pal Singh, Web Services Point WSP, Kotkapura on 2020-08-12

[$2000][1138877] Medium CVE-2021-21128: Heap buffer overflow in Blink. Reported by Liang Dong on 2020-10-15

[$1000][1140403] Medium CVE-2021-21129: Insufficient policy enforcement in File System API. Reported by Maciej Pulikowski on 2020-10-20

[$1000][1140410] Medium CVE-2021-21130: Insufficient policy enforcement in File System API. Reported by Maciej Pulikowski on 2020-10-20

[$1000][1140417] Medium CVE-2021-21131: Insufficient policy enforcement in File System API. Reported by Maciej Pulikowski on 2020-10-20

[$TBD][1128206] Medium CVE-2021-21132: Inappropriate implementation in DevTools. Reported by David Erceg on 2020-09-15

[$TBD][1157743] Medium CVE-2021-21133: Insufficient policy enforcement in Downloads. Reported by wester0x01(https://twitter.com/wester0x01) on 2020-12-11

[$TBD][1157800] Medium CVE-2021-21134: Incorrect security UI in Page Info. Reported by wester0x01(https://twitter.com/wester0x01) on 2020-12-11

[$TBD][1157818] Medium CVE-2021-21135: Inappropriate implementation in Performance API. Reported by ndevtk on 2020-12-11

[$2000][1038002] Low CVE-2021-21136: Insufficient policy enforcement in WebView. Reported by Shiv Sahni, Movnavinothan V and Imdad Mohammed on 2019-12-27

[$500][1093791] Low CVE-2021-21137: Inappropriate implementation in DevTools. Reported by bobblybear on 2020-06-11

[$500][1122487] Low CVE-2021-21138: Use after free in DevTools. Reported by Weipeng Jiang (@Krace) from Codesafe Team of Legendsec at Qi'anxin Group on 2020-08-27

[$N/A][937131] Low CVE-2021-21139: Inappropriate implementation in iframe sandbox. Reported by Jun Kokatsu, Microsoft Browser Vulnerability Research on 2019-03-01

[$N/A][1136327] Low CVE-2021-21140: Uninitialized Use in USB. Reported by David Manouchehri on 2020-10-08

[$N/A][1140435] Low CVE-2021-21141: Insufficient policy enforcement in File System API. Reported by Maciej Pulikowski on 2020-10-20

We would also like to thank all security researchers that worked with us during the development cycle to prevent security bugs from ever reaching the stable channel.

As usual, our ongoing internal security work was responsible for a wide range of fixes:

• [1168217] Various fixes from internal audits, fuzzing and other initiatives

Many of our security bugs are detected using AddressSanitizer, MemorySanitizer, UndefinedBehaviorSanitizer, Control Flow Integrity, libFuzzer, or AFL.