Home/CVE/There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a sy
CVE

CVE-2020-14311

There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a sy

There is an issue with grub2 before version 2.06 while handling symlink on ext filesystems. A filesystem containing a symbolic link with an inode size of UINT32_MAX causes an arithmetic overflow leading to a zero-sized memory allocation with subsequent heap-based buffer overflow.

MEDIUM · CVSS 5.7 EPSS 0.00032
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-122Heap-based Buffer Overflow
CWE-190Integer Overflow or Wraparound
CWE-190Integer Overflow or Wraparound
▤

Affected Products & Versions

7
gnu grub2< 2.06
redhat enterprise linuxall versions
redhat enterprise linux eusall versions
redhat enterprise linux server ausall versions
redhat enterprise linux server tusall versions
opensuse leapall versions
canonical ubuntu linuxall versions
▣

Scoring & Timeline

5.7
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD31 Jul 2020 · 10:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H
⚑

Vendor Advisories

21
msrcCVE-2020-14311
suse-csafopenSUSE-SU-2020:1168-1
suse-csafopenSUSE-SU-2020:1169-1
usnUSN-4432-1
rhsaRHSA-2020:3223Moderate
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.htmlMailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.htmlMailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/2Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/17/4Mailing ListThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/09/21/1Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311Issue TrackingThird Party Advisory
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