PatchaPalooza

CVE-2023-35316: Remote Procedure Call Runtime Information Disclosure Vulnerability

CVE-2023-35316 is an information disclosure vulnerability in Remote Procedure Call Runtime, rated Important by Microsoft, with a CVSS 3.1 base score of 6.5 (Medium). An attacker can exploit it remotely over the network, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild and rates exploitation as less likely. The EPSS model estimates a 1.40% probability of exploitation activity in the next 30 days, higher than 73% of all scored vulnerabilities. Microsoft released the fix on 11 July 2023 in the July 2023 Patch Tuesday, delivered through 15 security updates (KB5028168, KB5028171, KB5028182, KB5028166 and more). It affects 33 products in 2 product families (Windows, ESU).

Key facts

CVE ID
CVE-2023-35316
Severity
Medium CVSS 6.5
Microsoft severity
Important
Impact
Information Disclosure
Exploited in the wild
No
Publicly disclosed
No
Exploitation likelihood
Less Likely
Weakness
CWE-125
EPSS
1.40% (percentile 73%)
CISA KEV
Not listed
Released
Last updated
Patch Tuesday
July 2023 Patch Tuesday
Product families
Windows, ESU

CVSS score and vector

Microsoft scores CVE-2023-35316 at 6.5 (temporal 5.7) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

MetricValue
Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
Confidentiality impactHigh
Integrity impactNone
Availability impactNone
Exploit code maturityUnproven
Remediation levelOfficial fix
Report confidenceConfirmed

Frequently asked questions (Microsoft)

What type of information could be disclosed by this vulnerability?

An attacker who successfully exploited this vulnerability could potentially read small portions of heap memory.

Affected products (33)

Windows

ProductSecurity updateTypeFixed buildRestart
Windows 10 Version 1809 for 32-bit SystemsKB5028168Security Update10.0.17763.4645Yes
Windows 10 Version 1809 for x64-based SystemsKB5028168Security Update10.0.17763.4645Yes
Windows 10 Version 1809 for ARM64-based SystemsKB5028168Security Update10.0.17763.4645Yes
Windows Server 2019KB5028168Security Update10.0.17763.4645Yes
Windows Server 2019 (Server Core installation)KB5028168Security Update10.0.17763.4645Yes
Windows Server 2022KB5028171Security Update10.0.20348.1850Yes
Windows Server 2022 (Server Core installation)KB5028171Security Update10.0.20348.1850Yes
Windows 11 version 21H2 for x64-based SystemsKB5028182Security Update10.0.22000.2176Yes
Windows 11 version 21H2 for ARM64-based SystemsKB5028182Security Update10.0.22000.2176Yes
Windows 10 Version 21H2 for 32-bit SystemsKB5028166Security Update10.0.19044.3208Yes
Windows 10 Version 21H2 for ARM64-based SystemsKB5028166Security Update10.0.19044.3208Yes
Windows 10 Version 21H2 for x64-based SystemsKB5028166Security Update10.0.19044.3208Yes
Windows 11 Version 22H2 for ARM64-based SystemsKB5028185Security Update10.0.22621.1992Yes
Windows 11 Version 22H2 for x64-based SystemsKB5028185Security Update10.0.22621.1992Yes
Windows 10 Version 22H2 for x64-based Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 for 32-bit SystemsKB5028186Security Update10.0.10240.20048Yes
Windows 10 for x64-based SystemsKB5028186Security Update10.0.10240.20048Yes
Windows 10 Version 1607 for 32-bit SystemsKB5028169Security Update10.0.14393.6085Yes
Windows 10 Version 1607 for x64-based SystemsKB5028169Security Update10.0.14393.6085Yes
Windows Server 2016KB5028169Security Update10.0.14393.6085Yes
Windows Server 2016 (Server Core installation)KB5028169Security Update10.0.14393.6085Yes

ESU

ProductSecurity updateTypeFixed buildRestart
Windows Server 2008 for 32-bit Systems Service Pack 2KB5028222
KB5028226		Monthly Rollup
Security Only		6.0.6003.22175
6.0.6003.22175		Yes
Yes
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)KB5028222
KB5028226		Monthly Rollup
Security Only		6.0.6003.22175
6.0.6003.22175		Yes
Yes
Windows Server 2008 for x64-based Systems Service Pack 2KB5028222
KB5028226		Monthly Rollup
Security Only		6.0.6003.22175
6.0.6003.22175		Yes
Yes
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)KB5028222
KB5028226		Monthly Rollup
Security Only		6.0.6003.22175
6.0.6003.22175		Yes
Yes
Windows Server 2008 R2 for x64-based Systems Service Pack 1KB5028240
KB5028224		Monthly Rollup
Security Only		6.1.7601.26623
6.1.7601.26623		Yes
Yes
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)KB5028240
KB5028224		Monthly Rollup
Security Only		6.1.7601.26623
6.1.7601.26623		Yes
Yes
Windows Server 2012KB5028232
KB5028233		Monthly Rollup
Security Only		6.2.9200.24374
6.2.9200.24374		Yes
Yes
Windows Server 2012 (Server Core installation)KB5028232
KB5028233		Monthly Rollup
Security Only		6.2.9200.24374
6.2.9200.24374		Yes
Yes
Windows Server 2012 R2KB5028228
KB5028223		Monthly Rollup
Security Only		6.3.9600.21063
6.3.9600.21075		Yes
Yes
Windows Server 2012 R2 (Server Core installation)KB5028228
KB5028223		Monthly Rollup
Security Only		6.3.9600.21063
6.3.9600.21075		Yes
Yes

Security updates (15)

NIST NVD data

NVD status
Modified
NVD CVSS
6.5 (MEDIUM)
NVD weakness
CWE-125
Published to NVD
NVD last modified

Affected configurations (CPE)

ProductVulnerable versions
windows 10 1507before 10.0.10240.20048
windows 10 1607before 10.0.14393.6085
windows 10 1809before 10.0.17763.4645
windows 10 21h2before 10.0.19041.3208
windows 10 22h2before 10.0.19045.3208
windows 11 21h2before 10.0.22000.2176
windows 11 22h2before 10.0.22621.1992
windows server 2008all listed versions
windows server 2008 r2 (x64)all listed versions
windows server 2012all listed versions
windows server 2012 r2all listed versions
windows server 2016all listed versions
windows server 2019all listed versions
windows server 2022all listed versions

References

Acknowledgments

  • Microsoft Offensive Research & Security Engineering with Microsoft

Revision history

VersionDateDescription
1.0Information published.

Sources