CVE-2019-11703
published 2019-07-23CVE-2019-11703: A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a…
PriorityP261critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EXPLOIT
EPSS
10.53%
95.2th percentile
A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | thunderbird | < thunderbird 1:60.7.1-1 (bookworm) | thunderbird 1:60.7.1-1 (bookworm) |
| mozilla | thunderbird | < 60.7.1 | 60.7.1 |
| mozilla | thunderbird | >= 0 < 1:60.7.1-1 | 1:60.7.1-1 |
| mozilla | thunderbird | >= 0 < 1:60.7.1-1 | 1:60.7.1-1 |
| mozilla | thunderbird | >= 0 < 1:60.7.1-1 | 1:60.7.1-1 |
| mozilla | thunderbird | >= 0 < 1:60.7.1-1 | 1:60.7.1-1 |
| mozilla | thunderbird | >= unspecified < 60.7.1 | 60.7.1 |
Detection & IOCsextracted from sources · hover to see the quote
- →Monitor for incoming email messages containing iCal/calendar attachments (.ics files) sent to Thunderbird clients versions prior to 60.7.1, which may trigger heap buffer overflow in parser_get_next_char() within icalparser.c. ↗
- →Alert on Thunderbird process crashes (potentially exploitable) when processing calendar attachments, as the vulnerability manifests initially as an out-of-bounds read that may progress to out-of-bounds write. ↗
- →Vector is network-delivered via incoming mail with calendar attachment — inspect SMTP/IMAP traffic for .ics attachments with malformed or unusually crafted string content targeting Thunderbird < 60.7.1. ↗
- ·Thunderbird can be configured to use the JavaScript-based icaljs parser instead of the vulnerable libical C library, fully mitigating this vulnerability without patching. ↗
- ·The vulnerable code originates from a fork of upstream libical version 0.47; the upstream fix was committed pre-v2.0.0 (2015-08-11) but was never backported into Thunderbird's bundled copy until the 60.7.1 patch. ↗
- ·No pointer-based writes are possible directly from parser_get_next_char; the overflow is a heap over-read, though RCE via further exploitation cannot be ruled out. ↗
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvdv2.07.5HIGHAV:N/AC:L/Au:N/C:P/I:P/A:P
osv9.8CRITICAL
vendor_debian9.8CRITICAL
vendor_redhat9.8CRITICAL
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Ubuntu
Thunderbird vulnerabilities
vendor_ubuntu·2019-06-20
CVE-2019-11703 Thunderbird vulnerabilities
Title: Thunderbird vulnerabilities
Summary: Several security issues were fixed in Thunderbird.
Multiple memory safety issues were discovered in Thunderbird. If a user
were tricked in to opening a specially crafted message, an attacker could
potentially exploit these to cause a denial of service, or execute
arbitrary code.
Instructions: After a standard system update you need to restart Thunderbird to make
all the necessary changes.
Red Hat
libical: Heap buffer over read in icalparser.c parser_get_next_char
vendor_redhat·2019-06-13·CVSS 9.8
CVE-2019-11703 [CRITICAL] CWE-122 libical: Heap buffer over read in icalparser.c parser_get_next_char
libical: Heap buffer over read in icalparser.c parser_get_next_char
A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.
Mitigation: Thunderbird can be configured to use icaljs instead of libical by setting `calendar.icaljs = true` in preferences, mitigating this vulnerability.
Package: libical (Red Hat Enterprise Linux 6) - Out of support scope
Package: libical (Red Hat Enterprise Linux 7) - Not affected
Package: libical (Red Hat Enterprise Linux 8) - Not affected
Debian
CVE-2019-11703: thunderbird - A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in ...
vendor_debian·2019·CVSS 9.8
CVE-2019-11703 [CRITICAL] CVE-2019-11703: thunderbird - A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in ...
A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.
Scope: local
bookworm: resolved (fixed in 1:60.7.1-1)
bullseye: resolved (fixed in 1:60.7.1-1)
forky: resolved (fixed in 1:60.7.1-1)
sid: resolved (fixed in 1:60.7.1-1)
trixie: resolved (fixed in 1:60.7.1-1)
GHSA
GHSA-j937-8hgv-v466: A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting
ghsa_unreviewed·2022-05-24
CVE-2019-11703 [CRITICAL] CWE-119 GHSA-j937-8hgv-v466: A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting
A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.
OSV
CVE-2019-11703: A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting
osv·2019-07-23·CVSS 9.8
CVE-2019-11703 [CRITICAL] CVE-2019-11703: A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting
A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.
No detection rules found.
Bugzilla
CVE-2019-11703 thunderbird: Heap buffer over read in icalparser.c parser_get_next_char [fedora-all]
bugzilla·2019-06-14·CVSS 9.8
CVE-2019-11703 [CRITICAL] CVE-2019-11703 thunderbird: Heap buffer over read in icalparser.c parser_get_next_char [fedora-all]
CVE-2019-11703 thunderbird: Heap buffer over read in icalparser.c parser_get_next_char [fedora-all]
This is an automatically created tracking bug! It was created to ensure
that one or more security vulnerabilities are fixed in affected versions
of fedora-all.
For comments that are specific to the vulnerability please use bugs filed
against the "Security Response" product referenced in the "Blocks" field.
For more information see:
http://fedoraproject.org/wiki/Security/TrackingBugs
When submitting as an update, use the fedpkg template provided in the next
comment(s). This will include the bug IDs of this tracking bug as well as
the relevant top-level CVE bugs.
Please also mention the CVE IDs being fixed in the RPM changelog and the
fedpkg commit message.
NOTE: this issue affects multi
Bugzilla
CVE-2019-11703 libical: Heap buffer over read in icalparser.c parser_get_next_char
bugzilla·2019-06-12·CVSS 9.8
CVE-2019-11703 [CRITICAL] CVE-2019-11703 libical: Heap buffer over read in icalparser.c parser_get_next_char
CVE-2019-11703 libical: Heap buffer over read in icalparser.c parser_get_next_char
A flaw was found in Mozilla Thunderbird. A Heap-based buffer over read in parser_get_next_char function in icalparser.c might lead to application crash.
Upstream bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1553820
Discussion:
Is this for Thunderbird only, or the libical package is also affected? I would verify that myself, but I do not have access to any related bug report mentioned here, neither to the upstream Mozilla bug.
---
External References:
https://www.mozilla.org/en-US/security/advisories/mfsa2019-17/
---
Mitigation:
Thunderbird can be configured to use icaljs instead of libical by setting `calendar.icaljs = true` in preferences, mitigating this vulnerability.
---
Created thunder
https://bugzilla.mozilla.org/show_bug.cgi?id=1553820https://security.gentoo.org/glsa/201908-20https://www.mozilla.org/security/advisories/mfsa2019-17/https://bugzilla.mozilla.org/show_bug.cgi?id=1553820https://security.gentoo.org/glsa/201908-20https://www.mozilla.org/security/advisories/mfsa2019-17/
2019-07-23
Published