Bug 1852490 (CVE-2020-0182)
| Summary: | CVE-2020-0182 libexif: out of bounds read due to a missing bounds check in exif_entry_get_value function in exif-entry.c | ||
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| Product: | [Other] Security Response | Reporter: | Guilherme de Almeida Suckevicz <gsuckevi> |
| Component: | vulnerability | Assignee: | Red Hat Product Security <security-response-team> |
| Status: | CLOSED ERRATA | QA Contact: | |
| Severity: | low | Docs Contact: | |
| Priority: | low | ||
| Version: | unspecified | CC: | ajax, caillon+fedoraproject, gnome-sig, john.j5live, mcatanza, rdieter, rhbugs, rhughes, rstrode, sandmann, thomasj, yselkowi |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2020-09-29 22:02:05 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1852491, 1853460, 1853461 | ||
| Bug Blocks: | 1852493 | ||
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Description
Guilherme de Almeida Suckevicz
2020-06-30 14:27:45 UTC
Created libexif tracking bugs for this issue: Affects: fedora-all [bug 1852491] There is a possible small out-of-bounds read in exif_entry_get_value() in cases where entry->data is not NULL-terminated or smaller than 7 bytes in length. This is because the standard does not require the entry->data to be NULL terminated or a specific length. Since the code checked for example, strncmp ((char *)entry->data, "Minolta", 7)), there was a possibility of a limited out-of-bounds read here. The patch ensures that before strncmp() is called, the entry size is large enough to not read out-of-bounds data. Information disclosure is very limited here though for each entry because there is already a hardcoded relatively small value passed to strncmp() in the lenth parameter. This could likely also cause functional issues in cases where the strncmp() fails due to an unexpected entry->data string. Mitigation: This flaw could be mitigated by not passing untrusted input to libexif. This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2020:4040 https://access.redhat.com/errata/RHSA-2020:4040 This bug is now closed. Further updates for individual products will be reflected on the CVE page(s): https://access.redhat.com/security/cve/cve-2020-0182 This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2020:4766 https://access.redhat.com/errata/RHSA-2020:4766 |