CVE-2019-12529
Published: 11 July 2019
An issue was discovered in Squid 2.x through 2.7.STABLE9, 3.x through 3.5.28, and 4.x through 4.7. When Squid is configured to use Basic Authentication, the Proxy-Authorization header is parsed via uudecode. uudecode determines how many bytes will be decoded by iterating over the input and checking its table. The length is then used to start decoding the string. There are no checks to ensure that the length it calculates isn't greater than the input buffer. This leads to adjacent memory being decoded as well. An attacker would not be able to retrieve the decoded data unless the Squid maintainer had configured the display of usernames on error pages.
Notes
| Author | Note |
|---|---|
| mdeslaur | as of 2019-07-12, no equivalent fix in 3.5.x tree |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
squid Launchpad, Ubuntu, Debian |
bionic |
Does not exist
|
| cosmic |
Ignored
(reached end-of-life)
|
|
| disco |
Released
(4.4-1ubuntu2.2)
|
|
| trusty |
Does not exist
|
|
| upstream |
Released
(4.8)
|
|
| xenial |
Does not exist
|
|
|
Patches: upstream: https://github.com/squid-cache/squid/commit/dd46b5417809647f561d8a5e0e74c3aacd235258 (v4) |
||
|
squid3 Launchpad, Ubuntu, Debian |
bionic |
Released
(3.5.27-1ubuntu1.3)
|
| cosmic |
Does not exist
|
|
| disco |
Does not exist
|
|
| upstream |
Needed
|
|
| xenial |
Released
(3.5.12-1ubuntu7.8)
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 5.9 |
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |