Vulnerability Details : CVE-2020-14311
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.
Vulnerability category: Overflow
Products affected by CVE-2020-14311
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:grub2:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-14311
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 16 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-14311
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
3.6
|
LOW | AV:L/AC:L/Au:N/C:N/I:P/A:P |
3.9
|
4.9
|
NIST | |
5.7
|
MEDIUM | CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:H |
0.5
|
5.2
|
Red Hat, Inc. | |
6.0
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H |
0.8
|
5.2
|
NIST |
CWE ids for CVE-2020-14311
-
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: secalert@redhat.com (Primary)
-
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Primary)
References for CVE-2020-14311
-
http://www.openwall.com/lists/oss-security/2021/09/17/4
oss-security - Re: Containers-optimized OS (COS) membership in the linux-distros listMailing List;Third Party Advisory
-
http://www.openwall.com/lists/oss-security/2021/09/21/1
oss-security - Re: Containers-optimized OS (COS) membership in the linux-distros listMailing List;Third Party Advisory
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https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-14311
1852014 – (CVE-2020-14311) CVE-2020-14311 grub2: Integer overflow in grub_ext2_read_link leads to heap-based buffer overflowIssue Tracking;Third Party Advisory
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http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00016.html
[security-announce] openSUSE-SU-2020:1168-1: important: Security updateMailing List;Third Party Advisory
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https://security.gentoo.org/glsa/202104-05
GRUB: Multiple vulnerabilities (GLSA 202104-05) — Gentoo securityThird Party Advisory
-
http://www.openwall.com/lists/oss-security/2021/09/17/2
oss-security - Containers-optimized OS (COS) membership in the linux-distros listMailing List;Third Party Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00017.html
[security-announce] openSUSE-SU-2020:1169-1: important: Security updateMailing List;Third Party Advisory
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https://usn.ubuntu.com/4432-1/
USN-4432-1: GRUB 2 vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
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