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CVE-2022-47629: ⚓ T6284 Another integer overflow in Libksba

Libksba before 1.6.3 is prone to an integer overflow vulnerability in the CRL signature parser.

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Here is the patch which will go into the next release

From f61a5ea4e0f6a80fd4b28ef0174bee77793cf070 Mon Sep 17 00:00:00 2001 From: Werner Koch [email protected] Date: Tue, 22 Nov 2022 16:36:46 +0100 Subject: [PATCH] Fix an integer overflow in the CRL signature parser.

* src/crl.c (parse_signature): N+N2 now checked for overflow.

* src/ocsp.c (parse_response_extensions): Do not accept too large values. (parse_single_extensions): Ditto. –

The second patch is an extra safegourd not related to the reported bug.

GnuPG-bug-id: 6284 Reported-by: Joseph Surin, elttam — src/crl.c | 2 ± src/ocsp.c | 12 ++++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/crl.c b/src/crl.c index 9f71c85…2e6ca29 100644 — a/src/crl.c +++ b/src/crl.c @@ -1349,7 +1349,7 @@ parse_signature (ksba_crl_t crl) && !ti.is_constructed) ) return gpg_error (GPG_ERR_INV_CRL_OBJ); n2 = ti.nhdr + ti.length; - if (n + n2 >= DIM(tmpbuf)) + if (n + n2 >= DIM(tmpbuf) || (n + n2) < n) return gpg_error (GPG_ERR_TOO_LARGE); memcpy (tmpbuf+n, ti.buf, ti.nhdr); err = read_buffer (crl->reader, tmpbuf+n+ti.nhdr, ti.length); diff --git a/src/ocsp.c b/src/ocsp.c index d4cba04…657d15f 100644 — a/src/ocsp.c +++ b/src/ocsp.c @@ -721,6 +721,12 @@ parse_response_extensions (ksba_ocsp_t ocsp, || memcmp (ocsp->nonce, data, ti.length)) ocsp->bad_nonce = 1; } + if (ti.length > (1<<24)) + { + /* Bail out on much too large objects. */ + err = gpg_error (GPG_ERR_BAD_BER); + goto leave; + } ex = xtrymalloc (sizeof *ex + strlen (oid) + ti.length); if (!ex) { @@ -788,6 +794,12 @@ parse_single_extensions (struct ocsp_reqitem_s *ri, err = parse_octet_string (&data, &datalen, &ti); if (err) goto leave; + if (ti.length > (1<<24)) + { + /* Bail out on much too large objects. */ + err = gpg_error (GPG_ERR_BAD_BER); + goto leave; + } ex = xtrymalloc (sizeof *ex + strlen (oid) + ti.length); if (!ex) { – 2.32.0

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