Vulnerability Details : CVE-2023-6992
Cloudflare version of zlib library was found to be vulnerable to memory corruption issues affecting the deflation algorithm implementation (deflate.c). The issues resulted from improper input validation and heap-based buffer overflow.
A local attacker could exploit the problem during compression using a crafted malicious file potentially leading to denial of service of the software.
Patches: The issue has been patched in commit 8352d10 https://github.com/cloudflare/zlib/commit/8352d108c05db1bdc5ac3bdf834dad641694c13c . The upstream repository is not affected.
Vulnerability category: OverflowMemory CorruptionInput validationDenial of service
Products affected by CVE-2023-6992
- cpe:2.3:a:cloudflare:zlib:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2023-6992
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2023-6992
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
4.0
|
MEDIUM | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L |
1.4
|
2.5
|
Cloudflare, Inc. | 2024-01-04 |
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST | 2024-01-10 |
CWE ids for CVE-2023-6992
-
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.Assigned by: cna@cloudflare.com (Secondary)
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A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().Assigned by: cna@cloudflare.com (Secondary)
-
The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.Assigned by: cna@cloudflare.com (Secondary)
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The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2023-6992
-
https://github.com/cloudflare/zlib
GitHub - cloudflare/zlib: Cloudflare fork of zlib with massive performance improvementsProduct
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https://github.com/cloudflare/zlib/security/advisories/GHSA-vww9-j87r-4cqh
Memory corruption issues is Cloudflare zlib implementation · Advisory · cloudflare/zlib · GitHubPatch;Third Party Advisory
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