Vulnerability in HEASARC cfitsio

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

CFITSIO through 4.7.0 contains a heap-based out-of-bounds read vulnerability in the HCOMPRESS tile decoder that allows attackers to read past the compressed tile buffer via input_nnybble in fits_hdecompress.c. Attackers can supply a crafted FITS file with ZCMPTYPE HCOMPRESS_1 declaring oversized tile geometry to crash applications calling fits_read_pix or disclose limited heap memory.

[ 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/HEASARC/cfitsioProduct
• github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/fits_hdecompre…Product
• github.com/HEASARC/cfitsio/blob/d6d27653740864a0483e74cff23c53e34e1dceee/imcompress.cProduct
• hackmd.io/@haind-pwn/cfitsio-zdither0-dither-seed-oob-readExploitMitigationThird Party Advisory
• www.vulncheck.com/advisories/cfitsio-through-4.7.0-heap-out-of-bounds-read-via-hcompres…Third Party Advisory