CVE-2023-46724
Published: 1 November 2023
Squid is a caching proxy for the Web. Due to an Improper Validation of Specified Index bug, Squid versions 3.3.0.1 through 5.9 and 6.0 prior to 6.4 compiled using `--with-openssl` are vulnerable to a Denial of Service attack against SSL Certificate validation. This problem allows a remote server to perform Denial of Service against Squid Proxy by initiating a TLS Handshake with a specially crafted SSL Certificate in a server certificate chain. This attack is limited to HTTPS and SSL-Bump. This bug is fixed in Squid version 6.4. In addition, patches addressing this problem for the stable releases can be found in Squid's patch archives. Those who you use a prepackaged version of Squid should refer to the package vendor for availability information on updated packages.
Notes
| Author | Note |
|---|---|
| mdeslaur | only affects builds with openssl, which is not enabled in focal and earlier |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
squid Launchpad, Ubuntu, Debian |
bionic |
Ignored
(end of standard support)
|
| focal |
Not vulnerable
(code not compiled)
|
|
| jammy |
Released
(5.7-0ubuntu0.22.04.2)
|
|
| lunar |
Released
(5.7-1ubuntu3.1)
|
|
| mantic |
Released
(6.1-2ubuntu1.1)
|
|
| trusty |
Ignored
(end of standard support)
|
|
| upstream |
Needs triage
|
|
| xenial |
Ignored
(end of standard support)
|
|
|
Patches: upstream: https://github.com/squid-cache/squid/commit/b70f864940225dfe69f9f653f948e787f99c3810 upstream: https://github.com/squid-cache/squid/commit/12b8efc07ff74548d5582c4890f8bdb9057a1bb3 upstream: https://github.com/squid-cache/squid/commit/792ef23e6e1c05780fe17f733859eef6eb8c8be3 |
||
|
squid3 Launchpad, Ubuntu, Debian |
bionic |
Needs triage
|
| focal |
Does not exist
|
|
| jammy |
Does not exist
|
|
| lunar |
Does not exist
|
|
| mantic |
Does not exist
|
|
| trusty |
Ignored
(end of standard support)
|
|
| upstream |
Needs triage
|
|
| xenial |
Needs triage
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.5 |
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |