CVE-2023-34095 cpdb-libs vulnerable to buffer overflows via scanf
Attackers can trigger buffer overflows in cpdb-libs via long strings in configuration files or command lines, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-34095?
CVE-2023-34095 is a critical memory corruption vulnerability in OpenPrinting cpdb-libs, published on 14 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2023-34095?
It affects 1 product.
Products include Openprinting Cpdb-Libs.
How do I fix CVE-2023-34095?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-34095 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-34095 exists.
Sources
Also known as DEBIAN-CVE-2023-34095, GHSA-25j7-9gfc-f46x, UBUNTU-CVE-2023-34095, USN-6204-1.