CVE-2023-34095: Buffer Overflow
First published: Wed Jun 14 2023(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Openprinting Cpdb-libs | >=1.0<2.0 | |
| Openprinting Cpdb-libs | =2.0-beta1 | |
| Openprinting Cpdb-libs | =2.0-beta2 | |
| Openprinting Cpdb-libs | =2.0-beta3 | |
| Openprinting Cpdb-libs | =2.0-beta4 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2023/06/14/7
- https://github.com/OpenPrinting/cpdb-libs/blob/85555fba64d34f53a2fce099b0488904cc48ed35/cpdb/cpdb-frontend.c#L372
- https://github.com/OpenPrinting/cpdb-libs/blob/85555fba64d34f53a2fce099b0488904cc48ed35/tools/cpdb-text-frontend.c#L362
- https://github.com/OpenPrinting/cpdb-libs/blob/85555fba64d34f53a2fce099b0488904cc48ed35/tools/cpdb-text-frontend.c#L453
- https://github.com/OpenPrinting/cpdb-libs/commit/f181bd1f14757c2ae0f17cc76dc20421a40f30b7
- https://github.com/OpenPrinting/cpdb-libs/security/advisories/GHSA-25j7-9gfc-f46x
Frequently Asked Questions
What is CVE-2023-34095?
CVE-2023-34095 is a vulnerability in cpdb-libs, which is the frontend and backend libraries for the Common Printing Dialog Backends (CPDB) project.
What is the severity of CVE-2023-34095?
CVE-2023-34095 has a severity rating of 9.8 (Critical).
How does CVE-2023-34095 work?
CVE-2023-34095 is a buffer overflow vulnerability that occurs due to improper use of `scanf(3)` in cpdb-libs.
Which versions of cpdb-libs are affected by CVE-2023-34095?
Versions 1.0 through 2.0b4 of cpdb-libs are affected by CVE-2023-34095.
How can I fix CVE-2023-34095?
To fix CVE-2023-34095, it is recommended to update cpdb-libs to a version that is not affected by the vulnerability.
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- agent/softwarecombine
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- vendor/openprinting
- canonical/openprinting cpdb-libs
- version/openprinting cpdb-libs/1.0
- version/openprinting cpdb-libs/2.0-beta1
- version/openprinting cpdb-libs/2.0-beta2
- version/openprinting cpdb-libs/2.0-beta3
- version/openprinting cpdb-libs/2.0-beta4