Cloudflare zlib deflate.c heap-based overflow

CVSS Meta Temp Score
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CTI Interest Score
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4.6$0-$5k0.00

Summaryinfo

A vulnerability was found in Cloudflare zlib. It has been classified as critical. This vulnerability affects unknown code of the file deflate.c. Performing a manipulation results in heap-based overflow. This vulnerability is identified as CVE-2023-6992. The attack is only possible with local access. There is not any exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as critical, was found in Cloudflare zlib (Cloud Software) (unknown version). This affects an unknown code block of the file deflate.c. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. 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(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was released 01/04/2024 by Martin Schwarzl as 8352d108c05db1bdc5ac3bdf834dad641694c13c. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2023-6992 since 12/20/2023. Technical details are known, but no exploit is available.

Applying the patch 8352d10 is able to eliminate this problem.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.5
VulDB Temp Score: 4.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CNA Base Score: 4.0
CNA Vector (Cloudflare, Inc.): 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 8352d10

Timelineinfo

12/20/2023 🔍
01/04/2024 +15 days 🔍
01/04/2024 +0 days 🔍
01/24/2024 +20 days 🔍

Sourcesinfo

Advisory: 8352d108c05db1bdc5ac3bdf834dad641694c13c
Researcher: Martin Schwarzl
Status: Confirmed

CVE: CVE-2023-6992 (🔍)
GCVE (CVE): GCVE-0-2023-6992
GCVE (VulDB): GCVE-100-249681

Entryinfo

Created: 01/04/2024 12:54
Updated: 01/24/2024 08:36
Changes: 01/04/2024 12:54 (51), 01/24/2024 08:36 (12)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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