CVE-2020-36403 : HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse

HTSlib through 1.10.2 allows out-of-bounds write access in vcf_parse_format (called from vcf_parse and vcf_read).

Published 2021-07-01 03:15:08

Updated 2023-02-03 18:51:51

Source MITRE

View at NVD, CVE.org

Vulnerability category: Memory Corruption

Products affected by CVE-2020-36403

Htslib » Htslib
Versions up to, including, (<=) 1.10.2
cpe:2.3:a:htslib:htslib:*:*:*:*:*:*:*:*
Matching versions
When used together with: Linux » Linux Kernel » Version: N/A

EPSS FAQ

0.18%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 37 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.8	MEDIUM	AV:N/AC:M/Au:N/C:P/I:P/A:P	8.6	6.4	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	2.8	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

Assigned by: nvd@nist.gov (Primary)

https://github.com/google/oss-fuzz-vulns/blob/main/vulns/htslib/OSV-2020-955.yaml

oss-fuzz-vulns/OSV-2020-955.yaml at main · google/oss-fuzz-vulns · GitHub
Third Party Advisory
https://github.com/samtools/htslib/pull/1447

Update NEWS entry: CVE-2020-36403 affected all older versions of HTSlib by jmarshall · Pull Request #1447 · samtools/htslib · GitHub
Exploit;Third Party Advisory
https://github.com/samtools/htslib/commit/dcd4b7304941a8832fba2d0fc4c1e716e7a4e72c

Fix check for VCF record size · samtools/htslib@dcd4b73 · GitHub
Patch;Third Party Advisory
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24097

24097 - htslib:hts_open_fuzzer: Crash in vcf_parse_format - oss-fuzz
Exploit;Issue Tracking;Patch;Third Party Advisory

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