cpdb-libs up to 2.0b4 fscanf/scanf stack-based overflow

Summaryinfo

A vulnerability classified as critical was found in cpdb-libs up to 2.0b4. This affects the function fscanf/scanf. Executing a manipulation can lead to stack-based overflow. The identification of this vulnerability is CVE-2023-34095. The attack may be launched remotely. There is no exploit available. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability has been found in cpdb-libs up to 2.0b4 and classified as very critical. This vulnerability affects the function fscanf/scanf. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was shared 06/14/2023 as GHSA-25j7-9gfc-f46x. The advisory is available at github.com. This vulnerability was named CVE-2023-34095 since 05/25/2023. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 06/14/2023).

Applying the patch f181bd1f14757c2ae0f17cc76dc20421a40f30b7 is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Name

• cpdb-libs

Version

• 2.0b4

License

• open-source

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CPE 2.2info

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