CVE-2021-3200
Description
A flaw was found in libsolv. A buffer overflow vulnerability could cause a denial of service. The highest threat from this vulnerability is to system availability.
Statement
It is not clear how this flaw could cause denial of service in most practical situations in general, and it is not the case in Red Hat Enterprise Linux package management, therefore we have lowered the Impact to Low. This is due to the fact that it is a small out of bounds read triggered by the testsolv program in the code used to evaluate testcases: https://github.com/openSUSE/libsolv/blob/master/doc/testsolv.txt
Red Hat Update Infrastructure 3.1 is in the maintenance phase and we will not be fixing Medium/Low impact security bugs. Reference: https://access.redhat.com/support/policy/updates/rhui
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.3 | 3.3 | N/A |
| Attack Vector | Local | Local | N/A |
| Attack Complexity | Low | Low | N/A |
| Privileges Required | None | None | N/A |
| User Interaction | Required | Required | N/A |
| Scope | Unchanged | Unchanged | N/A |
| Confidentiality | None | None | N/A |
| Integrity Impact | None | None | N/A |
| Availability Impact | Low | Low | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
NVD: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Red Hat CVSS v3 Score Explanation
This flaw has been marked AV:L because libsolv is not bound to the network stack as a library, and neither is the affected testcase component. An application linked with libsolv could potentially be networked, but this CVSS score reflects the affected component (libsolv) only. We've marked A:L because the demonstrated issue is a 1 byte out-of-bound read in the testsolv program. The solution would be do not open the trouble file with the program again, and the denial of service is not necessarily persistent.
Understanding the Weakness (CWE)
Confidentiality
Technical Impact: Read Memory
An attacker could get secret values such as cryptographic keys, PII, memory addresses, or other information that could be used in additional attacks.
Confidentiality
Technical Impact: Bypass Protection Mechanism
Out-of-bounds memory could contain memory addresses or other information that can be used to bypass ASLR and other protection mechanisms in order to improve the reliability of exploiting a separate weakness for code execution.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
An attacker could cause a segmentation fault or crash by causing memory to be read outside of the bounds of the buffer. This is especially likely when the code reads a variable amount of data and assumes that a sentinel exists to stop the read operation, such as a NUL in a string.
Other
Technical Impact: Varies by Context
The read operation could produce other undefined or unexpected results.
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