Vulnerability Details : CVE-2020-29573
sysdeps/i386/ldbl2mpn.c in the GNU C Library (aka glibc or libc6) before 2.23 on x86 targets has a stack-based buffer overflow if the input to any of the printf family of functions is an 80-bit long double with a non-canonical bit pattern, as seen when passing a \x00\x04\x00\x00\x00\x00\x00\x00\x00\x04 value to sprintf. NOTE: the issue does not affect glibc by default in 2016 or later (i.e., 2.23 or later) because of commits made in 2015 for inlining of C99 math functions through use of GCC built-ins. In other words, the reference to 2.23 is intentional despite the mention of "Fixed for glibc 2.33" in the 26649 reference.
Vulnerability category: OverflowMemory Corruption
Products affected by CVE-2020-29573
- cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:x86:*
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
- cpe:2.3:h:netapp:solidfire_baseboard_management_controller:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-29573
0.22%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 60 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-29573
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2020-29573
-
The product writes data past the end, or before the beginning, of the intended buffer.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-29573
-
https://sourceware.org/pipermail/libc-alpha/2020-September/117779.html
[PATCH] x86: Harden printf against non-normal long double values (bug 26649)Patch;Third Party Advisory
-
https://sourceware.org/bugzilla/show_bug.cgi?id=26649
26649 – printf should handle non-normal x86 long double numbers gracefullyIssue Tracking;Patch;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20210122-0004/
December 2020 GNU C Library Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
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https://security.gentoo.org/glsa/202101-20
glibc: Multiple vulnerabilities (GLSA 202101-20) — Gentoo securityThird Party Advisory
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