جزئیات آسیب‌پذیری

HTSlib through 1.24 contains a heap out-of-bounds write and read vulnerability in bgzf_index_load_hfile() in bgzf.c that allows attackers to corrupt heap memory by supplying a crafted .gzi index entry count. A count of 0xFFFFFFFF truncates noffs to zero, causing writes past a malloc(0) buffer and an offs[-1] read in bgzf_useek(), resulting in heap corruption or crashes in tools like samtools and bcftools.

• https://github.com/samtools/htslib/pull/2057 issue-trackingpatch
• https://github.com/samtools/htslib/commit/18dddf02bb2c0053b32acec427723555a24b2873 patch
• https://github.com/samtools/htslib product
• https://github.com/samtools/htslib/blob/1.24/bgzf.c#L2504 technical-description
• https://hackmd.io/@haindpwn/htslib-bgzf-gzi-int-truncation-oob third-party-advisory
• https://github.com/samtools/htslib/issues/2113 issue-tracking
• https://www.vulncheck.com/advisories/htslib-through-1.24-heap-out-of-bounds-write-via-truncated-gzi-index-count third-party-advisory