CVE-2018-20847 — An improper computation of p_tx0, p_tx1, p_ty0 and p_ty1 in the function opj_get

An improper computation of p_tx0, p_tx1, p_ty0 and p_ty1 in the function opj_get_encoding_parameters in openjp2/pi.c in OpenJPEG through 2.3.0 can lead to an integer overflow.

01What is this vulnerability?

An improper computation of p_tx0, p_tx1, p_ty0 and p_ty1 in the function opj_get_encoding_parameters in openjp2/pi.c in OpenJPEG through 2.3.0 can lead to an integer overflow.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-06-26T17:07:43.000Z
• Last modified: 2024-08-05T12:12:28.701Z

09References

• github.com — https://github.com/uclouvain/openjpeg/pull/1168/commits/c58df149900df862806d0e89…
• github.com — https://github.com/uclouvain/openjpeg/commit/5d00b719f4b93b1445e6fb4c766b9a9883c…
• github.com — https://github.com/uclouvain/openjpeg/issues/431
• www.securityfocus.com — http://www.securityfocus.com/bid/108921
• lists.debian.org — https://lists.debian.org/debian-lts-announce/2019/07/msg00010.html