CVE-2021-43396
In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
In iconvdata/iso-2022-jp-3.c in the GNU C Library (aka glibc) 2.34, remote attackers can force iconv() to emit a spurious '\0' character via crafted ISO-2022-JP-3 data that is accompanied by an internal state reset. This may affect data integrity in certain iconv() use cases. NOTE: the vendor states "the bug cannot be invoked through user input and requires iconv to be invoked with a NULL inbuf, which ought to require a separate application bug to do so unintentionally. Hence there's no security impact to the bug.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 3.29% probability · 88th percentile
- CISA KEV
- Not listed
- Affected
- gnu/glibc · oracle/communications cloud native core binding support function · oracle/communications cloud native core network function cloud native environment · oracle/communications cloud native core network repository function · oracle/communications cloud native core security edge protection proxy · oracle/communications cloud native core unified data repository · oracle/enterprise operations monitor
- Source
- cve@mitre.org
References
- https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396Exploit, Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=28524Exploit, Issue Tracking, Third Party Advisory
- https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://blog.tuxcare.com/vulnerability/vulnerability-in-iconv-identified-by-tuxcare-team-cve-2021-43396Exploit, Third Party Advisory
- https://sourceware.org/bugzilla/show_bug.cgi?id=28524Exploit, Issue Tracking, Third Party Advisory
- https://sourceware.org/git/?p=glibc.git%3Ba=commit%3Bh=ff012870b2c02a62598c04daa1e54632e020fd7d
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.