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AUSCERT External Security Bulletin Redistribution
ESB-2021.0991
USN-4886-1: Privoxy vulnerabilities
23 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Privoxy
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-20276 CVE-2021-20275 CVE-2021-20273
CVE-2021-20272 CVE-2021-20217 CVE-2021-20216
CVE-2021-20215 CVE-2021-20214 CVE-2021-20213
CVE-2021-20212 CVE-2021-20211 CVE-2021-20210
CVE-2021-20209 CVE-2020-35502
Reference: ESB-2021.0425
Original Bulletin:
https://ubuntu.com/security/notices/USN-4886-1
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USN-4886-1: Privoxy vulnerabilities
22 March 2021
Several security issues were fixed in Privoxy.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
o Ubuntu 14.04 ESM
Packages
o privoxy - Privacy enhancing HTTP Proxy
Details
It was discovered that Privoxy incorrectly handled CGI requests. An attacker
could possibly use this issue to cause a denial of service or obtain sensitive
information. ( CVE-2020-35502 , CVE-2021-20209 , CVE-2021-20210 ,
CVE-2021-20213 , CVE-2021-20215 , CVE-2021-20216 , CVE-2021-20217 ,
CVE-2021-20272 , CVE-2021-20273 , CVE-2021-20275 )
It was discovered that Privoxy incorrectly handled certain regular
expressions. An attacker could possibly use this issue to cause a denial of
service or obtain sensitive information. ( CVE-2021-20212 , CVE-2021-20276 )
It was discovered that Privoxy incorrectly handled client tags. An attacker
could possibly use this issue to cause Privoxy to consume resources, resulting
in a denial of service. This issue only affected Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS and Ubuntu 20.10. ( CVE-2021-20211 )
It was discovered that Privoxy incorrectly handled client tags. An attacker
could possibly use this issue to cause Privoxy to consume resources, resulting
in a denial of service. This issue only affected Ubuntu 20.04 LTS and
Ubuntu 20.10. ( CVE-2021-20214 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o privoxy - 3.0.28-3ubuntu0.1
Ubuntu 20.04
o privoxy - 3.0.28-2ubuntu0.1
Ubuntu 18.04
o privoxy - 3.0.26-5ubuntu0.1
Ubuntu 16.04
o privoxy - 3.0.24-1ubuntu0.1
Ubuntu 14.04
o privoxy - 3.0.21-7+deb8u1ubuntu0.1~esm1
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-20213
o CVE-2021-20215
o CVE-2021-20212
o CVE-2021-20211
o CVE-2021-20276
o CVE-2020-35502
o CVE-2021-20216
o CVE-2021-20210
o CVE-2021-20209
o CVE-2021-20217
o CVE-2021-20273
o CVE-2021-20275
o CVE-2021-20272
o CVE-2021-20214
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