Vulnerability in samtools htslib

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• github.com/samtools/htslib
• github.com/samtools/htslib/blob/1.24/bgzf.c
• github.com/samtools/htslib/commit/18dddf02bb2c0053b32acec427723555a24b2873
• github.com/samtools/htslib/issues/2113
• github.com/samtools/htslib/pull/2057
• hackmd.io/@haindpwn/htslib-bgzf-gzi-int-truncation-oob
• www.vulncheck.com/advisories/htslib-through-1.24-heap-out-of-bounds-write-via-truncated…