Buffer overflow in GNU Bash
CVE-2012-6711
A heap-based buffer overflow exists in GNU Bash before 4.3 when wide characters, not supported by the current locale set in the LC_CTYPE environment variable, are printed through the echo built-in function. A local attacker, who can provide data to print through the "echo -e" built-in function, may use this flaw to crash a script or execute code with the privileges of the bash process. This occurs because ansicstr() in lib/sh/strtrans.c mishandles u32cconv().
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.0 (High). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (41.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 41.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- GNU Bash
- Red Hat Enterprise Linux — versions 7.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
- git.savannah.gnu.org/cgit/bash.git/commit/ (Patch, Mailing List, Third Party Advisory)
- www.securityfocus.com/bid/108824 (vdb-entry)
- support.f5.com/csp/article/K05122252
- support.f5.com/csp/article/K05122252
- usn.ubuntu.com/4180-1/ (vendor-advisory)
Frequently asked questions
- What is CVE-2012-6711?
- CVE-2012-6711 is a high-severity vulnerability in GNU Bash, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.0/10. Published 2019-06-18.
- How severe is CVE-2012-6711?
- High severity. CVSS v3 base score is 7.0 out of 10.
- Is CVE-2012-6711 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.