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CVE-2021-3999

Public on

Moderate ImpactWhat does this mean?
7.4CVSS v3 Base ScoreCVSS Score Breakdown


INSIGHTS VULNERABILITY ANALYSIS

View exposed systems


DESCRIPTION

A flaw was found in glibc. An off-by-one buffer overflow and underflow in
getcwd() may lead to memory corruption when the size of the buffer is exactly 1.
A local attacker who can control the input buffer and size passed to getcwd() in
a setuid program could use this flaw to potentially execute arbitrary code and
escalate their privileges on the system.


STATEMENT

This issue was rated as having Moderate impact because of the prerequisites
required for successful exploitation. To the best of our knowledge, there is no
actual setuid exposure to the vulnerable getcwd() usage pattern.

This issue was rated as having Moderate impact because of the prerequisites
required for successful exploitation. To the best of our knowledge, there is no
actual setuid exposure to the vulnerable getcwd() usage pattern.


MITIGATION

Mitigation for this issue is either not available or the currently available
options do not meet the Red Hat Product Security criteria comprising ease of use
and deployment, applicability to widespread installation base or stability.





ADDITIONAL INFORMATION

 * Bugzilla 2024637: CVE-2021-3999 glibc: Off-by-one buffer overflow/underflow
   in getcwd()
 * CWE-193: Off-by-one Error
 * FAQ: Frequently asked questions about CVE-2021-3999


AFFECTED PACKAGES AND ISSUED RED HAT SECURITY ERRATA

Search:

PlatformPackageStateErrataRelease DateRed Hat Enterprise Linux 6glibcOut of
support scopeRed Hat Enterprise Linux 7glibcOut of support scopeRed Hat
Enterprise Linux 8glibcFixedRHSA-2022:0896Red Hat Enterprise Linux
6compat-glibcOut of support scopeRed Hat Enterprise Linux 7compat-glibcOut of
support scope

Show 102550100 entries
FirstPrevious1NextLast
Showing 1 to 5 of 5 entries


Unless explicitly stated as not affected, all previous versions of packages in
any minor update stream of a product listed here should be assumed vulnerable,
although may not have been subject to full analysis.


COMMON VULNERABILITY SCORING SYSTEM (CVSS) SCORE DETAILS


CVSS V3 SCORE BREAKDOWN

Red HatNVDCVSS v3 Base Score7.4Attack VectorLocalAttack ComplexityHighPrivileges
RequiredNoneUser InteractionNoneScopeUnchangedConfidentialityHighIntegrity
ImpactHighAvailability ImpactHigh


CVSS V3 VECTOR

Red Hat: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H


ACKNOWLEDGEMENTS

Red Hat would like to thank Qualys Research Labs for reporting this issue.


EXTERNAL REFERENCES

https://www.openwall.com/lists/oss-security/2022/01/24/4

https://www.openwall.com/lists/oss-security/2022/01/24/4


FREQUENTLY ASKED QUESTIONS


WHY IS RED HAT'S CVSS V3 SCORE OR IMPACT DIFFERENT FROM OTHER VENDORS?

For open source software shipped by multiple vendors, the CVSS base scores may
vary for each vendor's version depending on the version they ship, how they ship
it, the platform, and even how the software is compiled. This makes scoring of
vulnerabilities difficult for third-party vulnerability databases such as NVD
that only provide a single CVSS base score for each vulnerability. Red Hat
scores reflect how a vulnerability affects our products specifically.

For more information, see https://access.redhat.com/solutions/762393.


MY PRODUCT IS LISTED AS "UNDER INVESTIGATION" OR "AFFECTED", WHEN WILL RED HAT
RELEASE A FIX FOR THIS VULNERABILITY?

 * "Under investigation" doesn't necessarily mean that the product is affected
   by this vulnerability. It only means that our Analysis Team is still working
   on determining whether the product is affected and how it is affected.
 * "Affected" means that our Analysis Team has determined that this product is
   affected by this vulnerability and might release a fix to address this in the
   near future.


WHAT CAN I DO IF MY PRODUCT IS LISTED AS "WILL NOT FIX"?

This depends mostly on the Impact of the vulnerability and the Life Cycle phase
in which your product is currently in. Overall, you have the following options:
 * Upgrade to a supported product version that includes a fix for this
   vulnerability (recommended)
 * Apply a mitigation (if one exists)
 * Open a support case to request a prioritization of releasing a fix for this
   vulnerability


WHY IS MY SECURITY SCANNER REPORTING MY PRODUCT AS VULNERABLE TO THIS
VULNERABILITY EVEN THOUGH MY PRODUCT VERSION IS FIXED OR NOT AFFECTED?

In order to maintain code stability and compatibility, Red Hat usually does not
rebase packages to entirely new versions. Instead, we backport fixes and new
features to an older version of the package we distribute. This can result in
some security scanners that only consider the package version to report the
package as vulnerable. To avoid this, we suggest that you use an OVAL-compatible
security scanner like OpenSCAP.

For more information, see https://access.redhat.com/blogs/766093/posts/2998921.


MY PRODUCT IS LISTED AS "OUT OF SUPPORT SCOPE". WHAT DOES THIS MEAN?

When a product is listed as "Out of Support Scope", it means a vulnerability
with the impact level assigned to this CVE is no longer covered by its current
support lifecycle phase. The product has been identified to contain the impacted
component, but analysis to determine whether it is affected or not by this
vulnerability was not performed. The product should be assumed to be affected.
Customers are advised to apply any mitigation options documented on this page,
consider removing or disabling the impacted component, or upgrade to a supported
version of the product that has an update available.

This page is generated automatically and has not been checked for errors or
omissions.

For clarification or corrections please contact Red Hat Product Security.

Last Modified:

CVE description copyright © 2021


Red Hat


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