Description
acl.c in Tinyproxy before 1.8.3, when an Allow configuration setting specifies a CIDR block, permits TCP connections from all IP addresses, which makes it easier for remote attackers to hide the origin of web traffic by leveraging the open HTTP proxy server.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tinyproxy | 1.8.2-2 | — |
| Debian 13 | tinyproxy | 1.8.2-2 | — |
| Debian 12 | tinyproxy | 1.8.2-2 | — |
| Debian 6.0 | tinyproxy | 1.8.2-1squeeze1 | DSA-2222-1 |
Advisories 1
- DSA-2222-1 tinyproxy - incorrect ACL processing Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=621493
- https://bugzilla.redhat.com/show_bug.cgi?id=694658
- 44274 third-party-advisory
- [oss-security] 20110408 Re: CVE request: tinyproxy runs as an open proxy when attempting to restrict allowable IP ranges mailing-list
- https://banu.com/cgit/tinyproxy/diff/?id=e8426f6662dc467bd1d827100481b95d9a4a23e4
- tinyproxy-aclc-sec-bypass(67256) vdb-entry
- https://banu.com/bugzilla/show_bug.cgi?id=90
- DSA-2222 vendor-advisory
- [oss-security] 20110407 CVE request: tinyproxy runs as an open proxy when attempting to restrict allowable IP ranges mailing-list