Описание
A flaw was found in HTSlib, a library for reading and writing bioinformatics file formats. When processing specially crafted CRAM (Compressed Reference-aligned Alignment Map) data, specifically records that omit sequence or quality data using the CONST, XPACK, or XRLE encodings, the library attempts to write to a NULL pointer. This NULL pointer dereference can cause the program to crash, leading to a Denial of Service (DoS).
Отчет
This MODERATE NULL pointer dereference in HTSlib's CRAM decoder affects the CONST, XPACK, and XRLE encodings when processing records with omitted data. Exploitation requires local access and user interaction. Impact is limited to availability (crash/DoS) with no confidentiality or integrity impact. Affects htslib and python-pysam in EPEL and Fedora. Fixed in versions 1.23.1, 1.22.2, and 1.21.1.
Дополнительная информация
Статус:
EPSS
5 Medium
CVSS3
Связанные уязвимости
HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data using a variety of encodings and compression methods. While most alignment records store DNA sequence and quality values, the format also allows them to omit this data in certain cases to save space. Due to some quirks of the CRAM format, it is necessary to handle these records carefully as they will actually store data that needs to be consumed and then discarded. Unfortunately the `CONST`, `XPACK` and `XRLE` encodings did not properly implement the interface needed to do this. Trying to decode records with omitted sequence or quality data using these encodings would result in an attempt to write to a NULL pointer. Exploiting this bug causes a NULL pointer dereference. Typically this will cause the program to crash. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.
HTSlib is a library for reading and writing bioinformatics file formats. CRAM is a compressed format which stores DNA sequence alignment data using a variety of encodings and compression methods. While most alignment records store DNA sequence and quality values, the format also allows them to omit this data in certain cases to save space. Due to some quirks of the CRAM format, it is necessary to handle these records carefully as they will actually store data that needs to be consumed and then discarded. Unfortunately the `CONST`, `XPACK` and `XRLE` encodings did not properly implement the interface needed to do this. Trying to decode records with omitted sequence or quality data using these encodings would result in an attempt to write to a NULL pointer. Exploiting this bug causes a NULL pointer dereference. Typically this will cause the program to crash. Versions 1.23.1, 1.22.2 and 1.21.1 include fixes for this issue. There is no workaround for this issue.
HTSlib is a library for reading and writing bioinformatics file format ...
EPSS
5 Medium
CVSS3