CVE-2023-34095
Publication date 14 June 2023
Last updated 24 July 2024
Ubuntu priority
cpdb-libs provides frontend and backend libraries for the Common Printing Dialog Backends (CPDB) project. In versions 1.0 through 2.0b4, cpdb-libs is vulnerable to buffer overflows via improper use of `scanf(3)`. cpdb-libs uses the `fscanf()` and `scanf()` functions to parse command lines and configuration files, dropping the read string components into fixed-length buffers, but does not limit the length of the strings to be read by `fscanf()` and `scanf()` causing buffer overflows when a string is longer than 1023 characters. A patch for this issue is available at commit f181bd1f14757c2ae0f17cc76dc20421a40f30b7. As all buffers have a length of 1024 characters, the patch limits the maximum string length to be read to 1023 by replacing all occurrences of `%s` with `%1023s` in all calls of the `fscanf()` and `scanf()` functions.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| cpdb-libs | 24.04 LTS noble |
Fixed 2.0~b4-0ubuntu4
|
| 22.04 LTS jammy |
Fixed 1.2.0-0ubuntu8.1.22.04.1
|
|
| 20.04 LTS focal |
Fixed 1.2.0-0ubuntu7.1
|
|
| 18.04 LTS bionic |
Vulnerable
|
|
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release |
Notes
alexmurray
in B,F,J and K the affected code appears to be contained in lib/frontend_helper.c and demo/print_frontend.c respectively
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
9.8 · Critical
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-6204-1
- CPDB vulnerability
- 5 July 2023